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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">DNA computing</span></span>
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<p><b>DNA computing</b> is an emerging branch of <a href="Unconventional_computing" title="Unconventional computing">unconventional computing</a> which uses <a href="DNA" title="DNA">DNA</a>, <a href="Biochemistry" title="Biochemistry">biochemistry</a>, and <a href="Molecular_biology" title="Molecular biology">molecular biology</a> hardware, instead of the traditional <a href="Electronic_computing" class="mw-redirect" title="Electronic computing">electronic computing</a>. Research and development in this area concerns theory, experiments, and applications of DNA computing. Although the field originally started with the demonstration of a computing application by <a href="Leonard_Adleman" title="Leonard Adleman">Len Adleman</a> in 1994, it has now been expanded to several other avenues such as the development of storage technologies,<sup id="cite_ref-:7_1-0" class="reference"><a href="#cite_note-:7-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> nanoscale imaging modalities,<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-:8_6-0" class="reference"><a href="#cite_note-:8-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> synthetic controllers and reaction networks,<sup id="cite_ref-:0_7-0" class="reference"><a href="#cite_note-:0-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-:1_8-0" class="reference"><a href="#cite_note-:1-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-:2_9-0" class="reference"><a href="#cite_note-:2-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-:3_10-0" class="reference"><a href="#cite_note-:3-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> etc.
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<div class="mw-heading mw-heading2"><h2 id="History">History</h2></div>
<p><a href="Leonard_Adleman" title="Leonard Adleman">Leonard Adleman</a> of the <a href="University_of_Southern_California" title="University of Southern California">University of Southern California</a> initially developed this field in 1994.<sup id="cite_ref-:11_11-0" class="reference"><a href="#cite_note-:11-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> Adleman demonstrated a <a href="Proof-of-concept" class="mw-redirect" title="Proof-of-concept">proof-of-concept</a> use of DNA as a form of computation which solved the seven-point <a href="Hamiltonian_path_problem" title="Hamiltonian path problem">Hamiltonian path problem</a>. Since the initial Adleman experiments, advances have occurred and various <a href="Turing_machine" title="Turing machine">Turing machines</a> have been proven to be constructible.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup>
</p><p>Since then the field has expanded into several avenues. In 1995, the idea for DNA-based memory was proposed by Eric Baum<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> who conjectured that a vast amount of data can be stored in a tiny amount of DNA due to its ultra-high density. This expanded the horizon of DNA computing into the realm of memory technology although the <i>in vitro</i> demonstrations were made after almost a decade.
</p><p>The field of DNA computing can be categorized as a sub-field of the broader <a href="DNA_nanotechnology" title="DNA nanotechnology">DNA nanoscience</a> field started by Ned Seeman about a decade before Len Adleman's demonstration.<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> Ned's original idea in the 1980s was to build arbitrary structures using bottom-up DNA self-assembly for applications in crystallography. However, it morphed into the field of structural DNA self-assembly<sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> which as of 2020 is extremely sophisticated. Self-assembled structure from a few nanometers tall all the way up to several tens of micrometers in size have been demonstrated in 2018.
</p><p>In 1994, Prof. Seeman's group demonstrated early DNA lattice structures using a small set of DNA components. While the demonstration by Adleman showed the possibility of DNA-based computers, the DNA design was trivial because as the number of nodes in a graph grows, the number of DNA components required in Adleman's implementation would grow exponentially. Therefore, computer scientists and biochemists started exploring tile-assembly where the goal was to use a small set of DNA strands as tiles to perform arbitrary computations upon growth. Other avenues that were theoretically explored in the late 90's include DNA-based security and cryptography,<sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> computational capacity of DNA systems,<sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> DNA memories and disks,<sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> and DNA-based robotics.<sup id="cite_ref-:10_22-0" class="reference"><a href="#cite_note-:10-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup>
</p><p>Before 2002, <a href="Lila_Kari" title="Lila Kari">Lila Kari</a> showed that the DNA operations performed by genetic recombination in some organisms are Turing complete.<sup id="cite_ref-bucke_23-0" class="reference"><a href="#cite_note-bucke-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup>
</p><p>In 2003, John Reif's group first demonstrated the idea of a DNA-based walker that traversed along a track similar to a line follower robot. They used molecular biology as a source of energy for the walker. Since this first demonstration, a wide variety of DNA-based walkers have been demonstrated.
</p>
<div class="mw-heading mw-heading2"><h2 id="Applications,_examples,_and_recent_developments">Applications, examples, and recent developments</h2></div>
<p>In 1994 <a href="Leonard_Adleman" title="Leonard Adleman">Leonard Adleman</a> presented the first prototype of a DNA computer. The <a href="https://de.wikipedia.org/wiki/TT-100" class="extiw external" title="de:TT-100">TT-100</a> was a test tube filled with 100 microliters of a DNA solution. He managed to solve an instance of the directed <a href="Hamiltonian_path" title="Hamiltonian path">Hamiltonian path</a> problem.<sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup> In Adleman's experiment, the Hamiltonian Path Problem was implemented notationally as the "<a href="Travelling_salesman_problem" title="Travelling salesman problem">travelling salesman problem</a>". For this purpose, different DNA fragments were created, each one of them representing a city that had to be visited. Every one of these fragments is capable of a linkage with the other fragments created. These DNA fragments were produced and mixed in a <a href="Test_tube" title="Test tube">test tube</a>. Within seconds, the small fragments form bigger ones, representing the different travel routes. Through a chemical reaction, the DNA fragments representing the longer routes were eliminated. The remains are the solution to the problem, but overall, the experiment lasted a week.<sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup> However, current technical limitations prevent the evaluation of the results. Therefore, the experiment isn't suitable for the application, but it is nevertheless a <a href="Proof_of_concept" title="Proof of concept">proof of concept</a>.
</p>
<div class="mw-heading mw-heading3"><h3 id="Combinatorial_problems">Combinatorial problems</h3></div>
<p>First results to these problems were obtained by <a href="Leonard_Adleman" title="Leonard Adleman">Leonard Adleman</a>.
</p>
<ul><li>In 1994: Solving a <a href="Hamiltonian_path_problem" title="Hamiltonian path problem">Hamiltonian path</a> in a graph with seven summits.</li>
<li>In 2002: Solving a <a href="NP-complete" class="mw-redirect" title="NP-complete">NP-complete</a> problem as well as a <a href="3-satisfiability" class="mw-redirect" title="3-satisfiability">3-SAT</a> problem with 20 variables.</li></ul>
<div class="mw-heading mw-heading3"><h3 id="Tic-tac-toe_game">Tic-tac-toe game</h3></div>
<p>In 2002, J. Macdonald, D. Stefanović and M. Stojanović created a DNA computer able to play <a href="Tic-tac-toe" title="Tic-tac-toe">tic-tac-toe</a> against a human player.<sup id="cite_ref-26" class="reference"><a href="#cite_note-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup> The calculator consists of nine bins corresponding to the nine squares of the game. Each bin contains a substrate and various combinations of DNA enzymes. The substrate itself is composed of a DNA strand onto which was grafted a fluorescent chemical group at one end, and the other end, a repressor group. Fluorescence is only active if the molecules of the substrate are cut in half. The DNA enzymes simulate <a href="Logic_function" class="mw-redirect" title="Logic function">logical functions</a>. For example, such a DNA will unfold if two specific types of DNA strand are introduced to reproduce the logic function AND.
</p><p>By default, the computer is considered to have played first in the central square. The human player starts with eight different types of DNA strands corresponding to the eight remaining boxes that may be played. To play box number i, the human player pours into all bins the strands corresponding to input #i. These strands bind to certain DNA enzymes present in the bins, resulting, in one of these bins, in the deformation of the DNA enzymes which binds to the substrate and cuts it. The corresponding bin becomes fluorescent, indicating which box is being played by the DNA computer. The DNA enzymes are divided among the bins in such a way as to ensure that the best the human player can achieve is a draw, as in real tic-tac-toe.
</p>
<div class="mw-heading mw-heading3"><h3 id="Neural_network_based_computing">Neural network based computing</h3></div>
<p>Kevin Cherry and <a href="Lulu_Qian" title="Lulu Qian">Lulu Qian</a> at Caltech developed a DNA-based artificial neural network that can recognize 100-bit hand-written digits. They achieved this by programming on a computer in advance with the appropriate set of weights represented by varying concentrations weight molecules which are later added to the test tube that holds the input DNA strands.<sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-:4_28-0" class="reference"><a href="#cite_note-:4-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Improved_speed_with_Localized_(cache-like)_Computing">Improved speed with Localized (cache-like) Computing</h3></div>
<p>One of the challenges of DNA computing is its slow speed. While DNA is a biologically compatible substrate, i.e., it can be used at places where silicon technology cannot, its computational speed is still very slow. For example, the square-root circuit used as a benchmark in the field takes over 100 hours to complete.<sup id="cite_ref-:5_29-0" class="reference"><a href="#cite_note-:5-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup> While newer ways with external enzyme sources are reporting faster and more compact circuits,<sup id="cite_ref-:6_30-0" class="reference"><a href="#cite_note-:6-30"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup> Chatterjee et al. demonstrated an interesting idea in the field to speed up computation through localized DNA circuits,<sup id="cite_ref-spacearch_31-0" class="reference"><a href="#cite_note-spacearch-31"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup> a concept being further explored by other groups.<sup id="cite_ref-:9_32-0" class="reference"><a href="#cite_note-:9-32"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup> This idea, while originally proposed in the field of computer architecture, has been adopted in this field as well. In computer architecture, it is very well-known that if the instructions are executed in sequence, having them loaded in the cache will inevitably lead to fast performance, also called the principle of localization. This is because with instructions in fast cache memory, there is no need swap them in and out of main memory, which can be slow.<sup id="cite_ref-spacearch_31-1" class="reference"><a href="#cite_note-spacearch-31"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup> Similarly, in localized DNA computing, the DNA strands responsible for computation are fixed on a breadboard-like substrate ensuring physical proximity of the computing gates. Such localized DNA computing techniques have been shown to potentially reduce the computation time by orders of magnitude.<sup id="cite_ref-spacearch_31-2" class="reference"><a href="#cite_note-spacearch-31"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Renewable_(or_reversible)_DNA_computing">Renewable (or reversible) DNA computing</h3></div>
<p>Subsequent research on DNA computing has produced reversible DNA computing, bringing the technology one step closer to the silicon-based computing used in (for example) <a href="Personal_computer" title="Personal computer">PCs</a>. In particular, John Reif and his group at Duke University have proposed two different techniques to reuse the computing DNA complexes. The first design uses dsDNA gates,<sup id="cite_ref-33" class="reference"><a href="#cite_note-33"><span class="cite-bracket">[</span>33<span class="cite-bracket">]</span></a></sup> while the second design uses DNA hairpin complexes.<sup id="cite_ref-34" class="reference"><a href="#cite_note-34"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup>
While both designs face some issues (such as reaction leaks), this appears to represent a significant breakthrough in the field of DNA computing. Some other groups have also attempted to address the gate reusability problem.<sup id="cite_ref-35" class="reference"><a href="#cite_note-35"><span class="cite-bracket">[</span>35<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-36" class="reference"><a href="#cite_note-36"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup>
</p><p>Using strand displacement reactions (SRDs), reversible proposals are presented in the "Synthesis Strategy of Reversible Circuits on DNA Computers" paper for implementing reversible gates and circuits on DNA computers by combining DNA computing and reversible computing techniques. This paper also proposes a universal reversible gate library (URGL) for synthesizing n-bit reversible circuits on DNA computers with an average length and cost of the constructed circuits better than the previous methods.<sup id="cite_ref-37" class="reference"><a href="#cite_note-37"><span class="cite-bracket">[</span>37<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Methods">Methods</h2></div>
<p>There are multiple methods for building a computing device based on DNA, each with its own advantages and disadvantages. Most of these build the basic logic gates (<a href="Logical_AND" class="mw-redirect" title="Logical AND">AND</a>, <a href="Logical_OR" class="mw-redirect" title="Logical OR">OR</a>, <a href="Logical_NOT" class="mw-redirect" title="Logical NOT">NOT</a>) associated with <a href="Digital_logic" class="mw-redirect" title="Digital logic">digital logic</a> from a DNA basis. Some of the different bases include DNAzymes, <a href="Oligonucleotide" title="Oligonucleotide">deoxyoligonucleotides</a>, enzymes, and toehold exchange.
</p>
<div class="mw-heading mw-heading3"><h3 id="Strand_displacement_mechanisms">Strand displacement mechanisms</h3></div>
<p>The most fundamental operation in DNA computing and molecular programming is the strand displacement mechanism. Currently, there are two ways to perform strand displacement:
</p>
<ul><li><a href="Toehold_mediated_strand_displacement" title="Toehold mediated strand displacement">Toehold mediated strand displacement</a> (TMSD)<sup id="cite_ref-:5_29-1" class="reference"><a href="#cite_note-:5-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup></li>
<li>Polymerase-based strand displacement (PSD)<sup id="cite_ref-:0_7-1" class="reference"><a href="#cite_note-:0-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup></li></ul>
<div class="mw-heading mw-heading3"><h3 id="Toehold_exchange">Toehold exchange</h3></div>
<p>Besides simple strand displacement schemes, DNA computers have also been constructed using the concept of toehold exchange.<sup id="cite_ref-:4_28-1" class="reference"><a href="#cite_note-:4-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup> In this system, an input DNA strand binds to a <a href="Sticky_end" class="mw-redirect" title="Sticky end">sticky end</a>, or toehold, on another DNA molecule, which allows it to displace another strand segment from the molecule. This allows the creation of modular logic components such as AND, OR, and NOT gates and signal amplifiers, which can be linked into arbitrarily large computers. This class of DNA computers does not require enzymes or any chemical capability of the DNA.<sup id="cite_ref-38" class="reference"><a href="#cite_note-38"><span class="cite-bracket">[</span>38<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Chemical_reaction_networks_(CRNs)">Chemical reaction networks (CRNs)</h3></div>
<p>The full stack for DNA computing looks very similar to a traditional computer architecture. At the highest level, a C-like general purpose programming language is expressed using a set of chemical reaction networks (CRNs). This intermediate representation gets translated to domain-level DNA design and then implemented using a set of DNA strands. In 2010, Erik Winfree's group showed that DNA can be used as a substrate to implement arbitrary chemical reactions. This opened the way to design and synthesis of biochemical controllers since the expressive power of CRNs is equivalent to a Turing machine.<sup id="cite_ref-:0_7-2" class="reference"><a href="#cite_note-:0-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-:1_8-1" class="reference"><a href="#cite_note-:1-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-:2_9-1" class="reference"><a href="#cite_note-:2-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-:3_10-1" class="reference"><a href="#cite_note-:3-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> Such controllers can potentially be used <i>in vivo</i> for applications such as preventing hormonal imbalance.
</p>
<div class="mw-heading mw-heading3"><h3 id="DNAzymes">DNAzymes</h3></div>
<p>Catalytic DNA (<a href="Deoxyribozyme" title="Deoxyribozyme">deoxyribozyme</a> or DNAzyme) catalyze a reaction when interacting with the appropriate input, such as a matching <a href="Oligonucleotide" title="Oligonucleotide">oligonucleotide</a>. These DNAzymes are used to build logic gates analogous to digital logic in silicon; however, DNAzymes are limited to one-, two-, and three-input gates with no current implementation for evaluating statements in series.
</p><p>The DNAzyme logic gate changes its structure when it binds to a matching oligonucleotide and the fluorogenic substrate it is bonded to is cleaved free. While other materials can be used, most models use a fluorescence-based substrate because it is very easy to detect, even at the single molecule limit.<sup id="cite_ref-weiss_39-0" class="reference"><a href="#cite_note-weiss-39"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup> The amount of fluorescence can then be measured to tell whether or not a reaction took place. The DNAzyme that changes is then "used", and cannot initiate any more reactions. Because of this, these reactions take place in a device such as a continuous stirred-tank reactor, where old product is removed and new molecules added.
</p><p>Two commonly used DNAzymes are named E6 and 8-17. These are popular because they allow cleaving of a substrate in any arbitrary location.<sup id="cite_ref-40" class="reference"><a href="#cite_note-40"><span class="cite-bracket">[</span>40<span class="cite-bracket">]</span></a></sup> Stojanovic and MacDonald have used the E6 DNAzymes to build the MAYA I<sup id="cite_ref-41" class="reference"><a href="#cite_note-41"><span class="cite-bracket">[</span>41<span class="cite-bracket">]</span></a></sup> and <a href="MAYA_II" class="mw-redirect" title="MAYA II">MAYA II</a><sup id="cite_ref-42" class="reference"><a href="#cite_note-42"><span class="cite-bracket">[</span>42<span class="cite-bracket">]</span></a></sup> machines, respectively; Stojanovic has also demonstrated logic gates using the 8-17 DNAzyme.<sup id="cite_ref-43" class="reference"><a href="#cite_note-43"><span class="cite-bracket">[</span>43<span class="cite-bracket">]</span></a></sup> While these DNAzymes have been demonstrated to be useful for constructing logic gates, they are limited by the need of a metal cofactor to function, such as Zn<sup>2+</sup> or Mn<sup>2+</sup>, and thus are not useful <a href="In_vivo" title="In vivo">in vivo</a>.<sup id="cite_ref-weiss_39-1" class="reference"><a href="#cite_note-weiss-39"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-44" class="reference"><a href="#cite_note-44"><span class="cite-bracket">[</span>44<span class="cite-bracket">]</span></a></sup>
</p><p>A design called a <i>stem loop</i>, consisting of a single strand of DNA which has a loop at an end, are a dynamic structure that opens and closes when a piece of DNA bonds to the loop part. This effect has been exploited to create several <a href="Logic_gate" title="Logic gate">logic gates</a>. These logic gates have been used to create the computers MAYA I and <a href="MAYA_II" class="mw-redirect" title="MAYA II">MAYA II</a> which can play <a href="Tic-tac-toe" title="Tic-tac-toe">tic-tac-toe</a> to some extent.<sup id="cite_ref-45" class="reference"><a href="#cite_note-45"><span class="cite-bracket">[</span>45<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Enzymes">Enzymes</h3></div>
<p>Enzyme-based DNA computers are usually of the form of a simple <a href="Turing_machine" title="Turing machine">Turing machine</a>; there is analogous hardware, in the form of an enzyme, and software, in the form of DNA.<sup id="cite_ref-46" class="reference"><a href="#cite_note-46"><span class="cite-bracket">[</span>46<span class="cite-bracket">]</span></a></sup>
</p><p>Benenson, Shapiro and colleagues have demonstrated a DNA computer using the <a href="FokI" title="FokI">FokI</a> enzyme<sup id="cite_ref-shapiro_47-0" class="reference"><a href="#cite_note-shapiro-47"><span class="cite-bracket">[</span>47<span class="cite-bracket">]</span></a></sup> and expanded on their work by going on to show automata that diagnose and react to <a href="Prostate_cancer" title="Prostate cancer">prostate cancer</a>: under expression of the genes <a href="PPAP2B" title="PPAP2B">PPAP2B</a> and <a href="GSTP1" title="GSTP1">GSTP1</a> and an over expression of <a href="PIM1" title="PIM1">PIM1</a> and <a href="HPN_(gene)" title="HPN (gene)">HPN</a>.<sup id="cite_ref-shapiro_cancer_48-0" class="reference"><a href="#cite_note-shapiro_cancer-48"><span class="cite-bracket">[</span>48<span class="cite-bracket">]</span></a></sup> Their automata evaluated the expression of each gene, one gene at a time, and on positive diagnosis then released a single strand DNA molecule (ssDNA) that is an antisense for <a href="MDM2" class="mw-redirect" title="MDM2">MDM2</a>. MDM2 is a repressor of <a href="P53" title="P53">protein 53</a>, which itself is a tumor suppressor.<sup id="cite_ref-49" class="reference"><a href="#cite_note-49"><span class="cite-bracket">[</span>49<span class="cite-bracket">]</span></a></sup> On negative diagnosis it was decided to release a suppressor of the positive diagnosis drug instead of doing nothing. A limitation of this implementation is that two separate automata are required, one to administer each drug. The entire process of evaluation until drug release took around an hour to complete. This method also requires transition molecules as well as the FokI enzyme to be present. The requirement for the FokI enzyme limits application <i>in vivo</i>, at least for use in "cells of higher organisms".<sup id="cite_ref-kahan08_50-0" class="reference"><a href="#cite_note-kahan08-50"><span class="cite-bracket">[</span>50<span class="cite-bracket">]</span></a></sup> It should also be pointed out that the 'software' molecules can be reused in this case.
</p>
<div class="mw-heading mw-heading3"><h3 id="Algorithmic_self-assembly">Algorithmic self-assembly</h3></div>
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</style><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="DNA_nanotechnology#Algorithmic_self-assembly" title="DNA nanotechnology">DNA nanotechnology: Algorithmic self-assembly</a></div>
<p>DNA nanotechnology has been applied to the related field of DNA computing. DNA tiles can be designed to contain multiple sticky ends with sequences chosen so that they act as <a href="Wang_tile" title="Wang tile">Wang tiles</a>. A DX array has been demonstrated whose assembly encodes an <a href="Exclusive_or" title="Exclusive or">XOR</a> operation; this allows the DNA array to implement a <a href="Cellular_automaton" title="Cellular automaton">cellular automaton</a> which generates a <a href="Fractal" title="Fractal">fractal</a> called the <a href="Sierpinski_gasket" class="mw-redirect" title="Sierpinski gasket">Sierpinski gasket</a>. This shows that computation can be incorporated into the assembly of DNA arrays, increasing its scope beyond simple periodic arrays.<sup id="cite_ref-rothemund04winfree_51-1" class="reference"><a href="#cite_note-rothemund04winfree-51"><span class="cite-bracket">[</span>51<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Capabilities">Capabilities</h2></div>
<p>DNA computing is a form of <a href="Parallel_computing" title="Parallel computing">parallel computing</a> in that it takes advantage of the many different molecules of DNA to try many different possibilities at once.<sup id="cite_ref-52" class="reference"><a href="#cite_note-52"><span class="cite-bracket">[</span>52<span class="cite-bracket">]</span></a></sup> For certain specialized problems, DNA computers are faster and smaller than any other computer built so far. Furthermore, particular mathematical computations have been demonstrated to work on a DNA computer.
</p><p>DNA computing does not provide any new capabilities from the standpoint of <a href="Computability_theory_(computer_science)" class="mw-redirect" title="Computability theory (computer science)">computability theory</a>, the study of which problems are computationally solvable using different models of computation.
For example,
if the space required for the solution of a problem grows exponentially with the size of the problem (<a href="EXPSPACE" title="EXPSPACE">EXPSPACE</a> problems) on <a href="Von_Neumann_architecture" title="Von Neumann architecture">von Neumann machines</a>, it still grows exponentially with the size of the problem on DNA machines.
For very large EXPSPACE problems, the amount of DNA required is too large to be practical.
</p>
<div class="mw-heading mw-heading2"><h2 id="Alternative_technologies">Alternative technologies</h2></div>
<p>A partnership between <a href="IBM" title="IBM">IBM</a> and <a href="Caltech" class="mw-redirect" title="Caltech">Caltech</a> was established in 2009 aiming at "<a href="DNA_chip" class="mw-redirect" title="DNA chip">DNA chips</a>" production.<sup id="cite_ref-53" class="reference"><a href="#cite_note-53"><span class="cite-bracket">[</span>53<span class="cite-bracket">]</span></a></sup> A Caltech group is working on the manufacturing of these nucleic-acid-based integrated circuits. One of these chips can compute whole square roots.<sup id="cite_ref-54" class="reference"><a href="#cite_note-54"><span class="cite-bracket">[</span>54<span class="cite-bracket">]</span></a></sup> A compiler has been written in <a href="Perl" title="Perl">Perl</a>.<sup id="cite_ref-55" class="reference"><a href="#cite_note-55"><span class="cite-bracket">[</span>55<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Pros_and_cons">Pros and cons</h2></div>
<p>The slow processing speed of a DNA computer (the response time is measured in minutes, hours or days, rather than milliseconds) is compensated by its potential to make a high amount of multiple parallel computations. This allows the system to take a similar amount of time for a complex calculation as for a simple one. This is achieved by the fact that millions or billions of molecules interact with each other simultaneously. However, it is much harder to analyze the answers given by a DNA computer than by a digital one.
</p>
<div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2></div>
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<ul><li><a href="Biocomputer" class="mw-redirect" title="Biocomputer">Biocomputer</a></li>
<li><a href="Chemical_computer" title="Chemical computer">Chemical computer</a></li>
<li><a href="Computational_gene" title="Computational gene">Computational gene</a></li>
<li><a href="DNA_code_construction" class="mw-redirect" title="DNA code construction">DNA code construction</a></li>
<li><a href="DNA_digital_data_storage" title="DNA digital data storage">DNA digital data storage</a></li>
<li><a href="DNA_sequencing" title="DNA sequencing">DNA sequencing</a></li>
<li><a href="Membrane_computing" title="Membrane computing">Membrane computing</a></li>
<li><a href="Molecular_electronics" title="Molecular electronics">Molecular electronics</a></li>
<li><a href="Peptide_computing" title="Peptide computing">Peptide computing</a></li>
<li><a href="Parallel_computing" title="Parallel computing">Parallel computing</a></li>
<li><a href="Quantum_computing" title="Quantum computing">Quantum computing</a></li>
<li><a href="Transcriptor" title="Transcriptor">Transcriptor</a></li>
<li><a href="Wetware_computer" title="Wetware computer">Wetware computer</a></li>
<li><a href="Molecular_logic_gate" title="Molecular logic gate">Molecular logic gate</a></li></ul>
</div>
<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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<cite id="CITEREFWeiss1999" class="citation journal cs1">Weiss, S. (1999). "Fluorescence Spectroscopy of Single Biomolecules". <i>Science</i>. <b>283</b> (5408): <span class="nowrap">1676–</span>1683. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/1999Sci...283.1676W">1999Sci...283.1676W</a>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1126%2Fscience.283.5408.1676">10.1126/science.283.5408.1676</a>. <a href="PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/10073925">10073925</a>. <a href="S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:9697423">9697423</a>.</cite>. Also available here: <a rel="nofollow" class="external free" href="http://www.lps.ens.fr/~vincent/smb/PDF/weiss-1.pdf">http://www.lps.ens.fr/~vincent/smb/PDF/weiss-1.pdf</a></span>
</li>
<li id="cite_note-40"><span class="mw-cite-backlink"><b><a href="#cite_ref-40">^</a></b></span> <span class="reference-text">
<cite id="CITEREFSantoroJoyce1997" class="citation journal cs1">Santoro, S. W.; Joyce, G. F. (1997). <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC20710">"A general purpose RNA-cleaving DNA enzyme"</a>. <i>Proceedings of the National Academy of Sciences</i>. <b>94</b> (9): <span class="nowrap">4262–</span>4266. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/1997PNAS...94.4262S">1997PNAS...94.4262S</a>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.1073%2Fpnas.94.9.4262">10.1073/pnas.94.9.4262</a></span>. <a href="PMC_(identifier)" class="mw-redirect" title="PMC (identifier)">PMC</a> <span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC20710">20710</a></span>. <a href="PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/9113977">9113977</a>.</cite>. Also available here: <a rel="nofollow" class="external autonumber" href="http://www.pnas.org/content/94/9/4262.full.pdf">[2]</a></span>
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<li id="cite_note-41"><span class="mw-cite-backlink"><b><a href="#cite_ref-41">^</a></b></span> <span class="reference-text">
<cite id="CITEREFStojanovicStefanovic2003" class="citation journal cs1">Stojanovic, M. N.; Stefanovic, D. (2003). "A deoxyribozyme-based molecular automaton". <i>Nature Biotechnology</i>. <b>21</b> (9): <span class="nowrap">1069–</span>1074. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1038%2Fnbt862">10.1038/nbt862</a>. <a href="PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/12923549">12923549</a>. <a href="S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:184520">184520</a>.</cite>. Also available here: <a rel="nofollow" class="external autonumber" href="https://web.archive.org/web/20120401132040/http://www.cs.duke.edu/courses/cps296.6/current/papers/SS03.pdf">[3]</a></span>
</li>
<li id="cite_note-42"><span class="mw-cite-backlink"><b><a href="#cite_ref-42">^</a></b></span> <span class="reference-text">
<cite id="CITEREFMacDonaldLiSutovicLederman2006" class="citation journal cs1">MacDonald, J.; Li, Y.; Sutovic, M.; Lederman, H.; Pendri, K.; Lu, W.; Andrews, B. L.; Stefanovic, D.; Stojanovic, M. N. (2006). "Medium Scale Integration of Molecular Logic Gates in an Automaton". <i>Nano Letters</i>. <b>6</b> (11): <span class="nowrap">2598–</span>2603. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2006NanoL...6.2598M">2006NanoL...6.2598M</a>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1021%2Fnl0620684">10.1021/nl0620684</a>. <a href="PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/17090098">17090098</a>.</cite>. Also available here: <a rel="nofollow" class="external autonumber" href="http://www.ece.gatech.edu/research/labs/bwn/nanos/papers/Medium_Scale_Integration_of_Molecular.pdf">[4]</a></span>
</li>
<li id="cite_note-43"><span class="mw-cite-backlink"><b><a href="#cite_ref-43">^</a></b></span> <span class="reference-text">
<cite id="CITEREFStojanovicMitchellStefanovic2002" class="citation journal cs1">Stojanovic, M. N.; Mitchell, T. E.; Stefanovic, D. (2002). <a rel="nofollow" class="external text" href="https://figshare.com/articles/Deoxyribozyme-Based_Logic_Gates/3638808">"Deoxyribozyme-Based Logic Gates"</a>. <i>Journal of the American Chemical Society</i>. <b>124</b> (14): <span class="nowrap">3555–</span>3561. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2002JAChS.124.3555S">2002JAChS.124.3555S</a>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1021%2Fja016756v">10.1021/ja016756v</a>. <a href="PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/11929243">11929243</a>.</cite>. Also available at <a rel="nofollow" class="external autonumber" href="http://www.dna.caltech.edu/courses/cs191/paperscs191/stojanovic_mitchell_stefanovic2002.pdf">[5]</a></span>
</li>
<li id="cite_note-44"><span class="mw-cite-backlink"><b><a href="#cite_ref-44">^</a></b></span> <span class="reference-text">
<cite id="CITEREFCruzWithersLi2004" class="citation journal cs1">Cruz, R. P. G.; Withers, J. B.; Li, Y. (2004). <a rel="nofollow" class="external text" href="https://doi.org/10.1016%2Fj.chembiol.2003.12.012">"Dinucleotide Junction Cleavage Versatility of 8-17 Deoxyribozyme"</a>. <i>Chemistry & Biology</i>. <b>11</b> (1): <span class="nowrap">57–</span>67. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.1016%2Fj.chembiol.2003.12.012">10.1016/j.chembiol.2003.12.012</a></span>. <a href="Hdl_(identifier)" class="mw-redirect" title="Hdl (identifier)">hdl</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://hdl.handle.net/11375%2F23673">11375/23673</a></span>. <a href="PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/15112995">15112995</a>.</cite></span>
</li>
<li id="cite_note-45"><span class="mw-cite-backlink"><b><a href="#cite_ref-45">^</a></b></span> <span class="reference-text">Darko Stefanovic's Group, <a rel="nofollow" class="external text" href="https://digamma.cs.unm.edu/wiki/bin/view/McogPublicWeb/MolecularLogicGates">Molecular Logic Gates</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20100618033006/https://digamma.cs.unm.edu/wiki/bin/view/McogPublicWeb/MolecularLogicGates">Archived</a> 2010-06-18 at the <a href="Wayback_Machine" title="Wayback Machine">Wayback Machine</a> and <a rel="nofollow" class="external text" href="https://digamma.cs.unm.edu/wiki/bin/view/McogPublicWeb/MolecularAutomataMAYAII">MAYA II, a second-generation tic-tac-toe playing automaton</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20100618001044/https://digamma.cs.unm.edu/wiki/bin/view/McogPublicWeb/MolecularAutomataMAYAII">Archived</a> 2010-06-18 at the <a href="Wayback_Machine" title="Wayback Machine">Wayback Machine</a>.</span>
</li>
<li id="cite_note-46"><span class="mw-cite-backlink"><b><a href="#cite_ref-46">^</a></b></span> <span class="reference-text"><cite id="CITEREFShapiro1999" class="citation journal cs1"><a href="Ehud_Shapiro" title="Ehud Shapiro">Shapiro, Ehud</a> (1999-12-07). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20090103224150/http://www.wisdom.weizmann.ac.il/~udi/DNA5/scripps_short/index.htm">"A Mechanical Turing Machine: Blueprint for a Biomolecular Computer"</a>. <i>Interface Focus</i>. <b>2</b> (4). <a href="Weizmann_Institute_of_Science" title="Weizmann Institute of Science">Weizmann Institute of Science</a>: <span class="nowrap">497–</span>503. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1098%2Frsfs.2011.0118">10.1098/rsfs.2011.0118</a>. <a href="PMC_(identifier)" class="mw-redirect" title="PMC (identifier)">PMC</a> <span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3363030">3363030</a></span>. <a href="PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/22649583">22649583</a>. Archived from <a rel="nofollow" class="external text" href="http://www.wisdom.weizmann.ac.il/~udi/DNA5/scripps_short/index.htm">the original</a> on 2009-01-03<span class="reference-accessdate">. Retrieved <span class="nowrap">2009-08-13</span></span>.</cite></span>
</li>
<li id="cite_note-shapiro-47"><span class="mw-cite-backlink"><b><a href="#cite_ref-shapiro_47-0">^</a></b></span> <span class="reference-text"><cite id="CITEREFBenensonPaz-ElizurAdarKeinan2001" class="citation journal cs1">Benenson, Y.; Paz-Elizur, T.; Adar, R.; Keinan, E.; Livneh, Z.; Shapiro, E. (2001). <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3838952">"Programmable and autonomous computing machine made of biomolecules"</a>. <i>Nature</i>. <b>414</b> (6862): <span class="nowrap">430–</span>434. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2001Natur.414..430B">2001Natur.414..430B</a>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1038%2F35106533">10.1038/35106533</a>. <a href="PMC_(identifier)" class="mw-redirect" title="PMC (identifier)">PMC</a> <span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3838952">3838952</a></span>. <a href="PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/11719800">11719800</a>.</cite>. Also available here: <a rel="nofollow" class="external autonumber" href="http://www.technion.ac.il/~keinanj/pub/110.pdf">[6]</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20120510194658/http://www.technion.ac.il/~keinanj/pub/110.pdf">Archived</a> 2012-05-10 at the <a href="Wayback_Machine" title="Wayback Machine">Wayback Machine</a></span>
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<li id="cite_note-shapiro_cancer-48"><span class="mw-cite-backlink"><b><a href="#cite_ref-shapiro_cancer_48-0">^</a></b></span> <span class="reference-text"><cite id="CITEREFBenensonGilBen-DorAdar2004" class="citation journal cs1">Benenson, Y.; Gil, B.; Ben-Dor, U.; Adar, R.; Shapiro, E. (2004). <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3838955">"An autonomous molecular computer for logical control of gene expression"</a>. <i>Nature</i>. <b>429</b> (6990): <span class="nowrap">423–</span>429. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2004Natur.429..423B">2004Natur.429..423B</a>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1038%2Fnature02551">10.1038/nature02551</a>. <a href="PMC_(identifier)" class="mw-redirect" title="PMC (identifier)">PMC</a> <span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3838955">3838955</a></span>. <a href="PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/15116117">15116117</a>.</cite>. Also available here: <a rel="nofollow" class="external text" href="https://web.archive.org/web/20131023055858/http://www.wisdom.weizmann.ac.il/~udi/papers/automoleculcomp_nat04.pdf">An autonomous molecular computer for logical control of gene expression</a></span>
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<li id="cite_note-49"><span class="mw-cite-backlink"><b><a href="#cite_ref-49">^</a></b></span> <span class="reference-text">
<cite id="CITEREFBondHuLevine2005" class="citation journal cs1">Bond, G. L.; Hu, W.; Levine, A. J. (2005). "MDM2 is a Central Node in the p53 Pathway: 12 Years and Counting". <i><a href="Current_Cancer_Drug_Targets" title="Current Cancer Drug Targets">Current Cancer Drug Targets</a></i>. <b>5</b> (1): <span class="nowrap">3–</span>8. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.2174%2F1568009053332627">10.2174/1568009053332627</a>. <a href="PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/15720184">15720184</a>.</cite></span>
</li>
<li id="cite_note-kahan08-50"><span class="mw-cite-backlink"><b><a href="#cite_ref-kahan08_50-0">^</a></b></span> <span class="reference-text">
<cite id="CITEREFKahanGilAdarShapiro2008" class="citation journal cs1">Kahan, M.; Gil, B.; Adar, R.; Shapiro, E. (2008). "Towards molecular computers that operate in a biological environment". <i>Physica D: Nonlinear Phenomena</i>. <b>237</b> (9): <span class="nowrap">1165–</span>1172. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2008PhyD..237.1165K">2008PhyD..237.1165K</a>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1016%2Fj.physd.2008.01.027">10.1016/j.physd.2008.01.027</a>.</cite>. Also available here: <a rel="nofollow" class="external autonumber" href="http://www.ece.gatech.edu/research/labs/bwn/nanos/papers/Towards_molecular_computers_that_operate_in_a_biological_environment.pdf">[7]</a></span>
</li>
<li id="cite_note-rothemund04winfree-51"><span class="mw-cite-backlink">^ <a href="#cite_ref-rothemund04winfree_51-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-rothemund04winfree_51-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><cite id="CITEREFRothemundPapadakisWinfree2004" class="citation journal cs1">Rothemund, P. W. K.; Papadakis, N.; Winfree, E. (2004). <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC534809">"Algorithmic Self-Assembly of DNA Sierpinski Triangles"</a>. <i>PLOS Biology</i>. <b>2</b> (12): e424. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.1371%2Fjournal.pbio.0020424">10.1371/journal.pbio.0020424</a></span>. <a href="PMC_(identifier)" class="mw-redirect" title="PMC (identifier)">PMC</a> <span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC534809">534809</a></span>. <a href="PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/15583715">15583715</a>.</cite></span>
</li>
<li id="cite_note-52"><span class="mw-cite-backlink"><b><a href="#cite_ref-52">^</a></b></span> <span class="reference-text">
<cite id="CITEREFLewin2002" class="citation journal cs1">Lewin, D. I. (2002). "DNA computing". <i>Computing in Science & Engineering</i>. <b>4</b> (3): <span class="nowrap">5–</span>8. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2002CSE.....4c...5L">2002CSE.....4c...5L</a>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1109%2F5992.998634">10.1109/5992.998634</a>.</cite></span>
</li>
<li id="cite_note-53"><span class="mw-cite-backlink"><b><a href="#cite_ref-53">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external autonumber" href="http://media.caltech.edu/press_releases/13284">[8]</a>(Caltech's own article) <a rel="nofollow" class="external text" href="https://web.archive.org/web/20111014075545/http://media.caltech.edu/press_releases/13284">Archived</a> October 14, 2011, at the <a href="Wayback_Machine" title="Wayback Machine">Wayback Machine</a></span>
</li>
<li id="cite_note-54"><span class="mw-cite-backlink"><b><a href="#cite_ref-54">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://www.science.org/doi/full/10.1126/science.1200520">Scaling Up Digital Circuit Computation with DNA Strand Displacement Cascades</a></span>
</li>
<li id="cite_note-55"><span class="mw-cite-backlink"><b><a href="#cite_ref-55">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external autonumber" href="https://www.science.org/doi/abs/10.1126/science.1200520">[9]</a> Online</span>
</li>
</ol></div>
<div class="mw-heading mw-heading2"><h2 id="Further_reading">Further reading</h2></div>
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<ul><li><cite id="CITEREFMartyn_Amos2005" class="citation book cs1"><a href="Martyn_Amos" title="Martyn Amos">Martyn Amos</a> (June 2005). <a rel="nofollow" class="external text" href="https://www.springer.com/computer/theoretical+computer+science/book/978-3-540-65773-6"><i>Theoretical and Experimental DNA Computation</i></a>. Natural Computing Series. Springer. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>978-3-540-65773-6</bdi>.</cite> — The first general text to cover the whole field.</li>
<li><cite id="CITEREFGheorge_Paun,_Grzegorz_Rozenberg,_Arto_Salomaa1998" class="citation book cs1">Gheorge Paun, Grzegorz Rozenberg, <a href="Arto_Salomaa" title="Arto Salomaa">Arto Salomaa</a> (October 1998). <i>DNA Computing - New Computing Paradigms</i>. Springer-Verlag. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>978-3-540-64196-4</bdi>.</cite><span class="cs1-maint citation-comment"><code class="cs1-code">{{cite book}}</code>: CS1 maint: multiple names: authors list (link)</span> — The book starts with an introduction to DNA-related matters, the basics of biochemistry and language and computation theory, and progresses to the advanced mathematical theory of DNA computing.</li></ul>
<ul><li><cite id="CITEREFZoja_IgnatovaIsrael_Martinez-PerezKarl-Heinz_Zimmermann2008" class="citation book cs1">Zoja Ignatova; Israel Martinez-Perez; Karl-Heinz Zimmermann (January 2008). <a rel="nofollow" class="external text" href="https://www.springer.com/computer/bioinformatics/book/978-0-387-73635-8"><i>DNA Computing Models</i></a>. Springer. p. 288. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>978-0-387-73635-8</bdi>.</cite> — A new general text to cover the whole field.</li></ul>
</div>
<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>
<ul><li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20140726100148/http://www.alexpetty.com/index.php/2010/09/11/vortex-math-based-computing/">DNA modeled computing</a></li>
<li><a rel="nofollow" class="external text" href="http://computer.howstuffworks.com/dna-computer.htm">How Stuff Works explanation</a></li>
<li>Dirk de Pol: <a rel="nofollow" class="external text" href="https://unglaublich.de/dns-ein-neuer-supercomputer/"><i>DNS – Ein neuer Supercomputer?</i></a>. In: Die Neue Gesellschaft / Frankfurter Hefte <a href="ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/0177-6738">0177-6738</a>, Heft 2/96, Februar 1996, S. 170–172</li>
<li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20040825021955/http://physicsweb.org/article/news/6/3/11/">'DNA computer' cracks code</a>, Physics Web</li>
<li><a rel="nofollow" class="external text" href="http://archive.arstechnica.com/reviews/2q00/dna/dna-1.html">Ars Technica</a></li>
<li><a rel="nofollow" class="external text" href="https://www.nytimes.com/2004/04/29/science/29DNA.html">- The New York Times DNA Computer for detecting Cancer</a></li>
<li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20070715132025/http://www.sciam.com/article.cfm?articleID=0005BC6A-97DF-1446-951483414B7F0101">Bringing DNA computers to life, in Scientific American</a></li>
<li><a rel="nofollow" class="external text" href="http://www.treehugger.com/clean-technology/e-coli-bacteria-could-become-our-next-computer-hard-drives.html">Japanese Researchers store information in bacteria DNA</a></li>
<li><a rel="nofollow" class="external text" href="http://www.dna-computing.org/">International Meeting on DNA Computing and Molecular Programming</a></li>
<li><a rel="nofollow" class="external text" href="http://www.livescience.com/technology/dna-computers-100517.html">LiveScience.com-How DNA Could Power Computers</a></li></ul>
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