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<p>An <strong>operon</strong> is a functioning unit of key nucleotide sequences including an operator, a common promoter, and one or more structural genes, which is controlled as a unit to produce messenger RNA (mRNA), in the process of protein transcription.</p>
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<div class="thumbinner" style="WIDTH: 182px"><img class="thumbimage" height="22" alt="A typical operon." width="180" border="0" src="http://upload.wikimedia.org/wikipedia/en/thumb/b/ba/Operon.png/180px-Operon.png" width="180" border="0" />
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<div class="magnify"><img height="11" alt="" width="15" src="http://en.wikipedia.org/skins-1.5/common/images/magnify-clip.png" width="15" /></div>
A typical operon.</div>
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<li id="cite_note-0"><strong><a title="" href="http://en.wikipedia.org/wiki/Operon#cite_ref-0">^</a></strong> William Klug, Cummings, and Spencer. "Concepts of Genetics." 8th Ed. Pearson Education Inc, New Jersey: 2006. pg. 394-402 </li>
<li id="cite_note-1"><strong><a title="" href="http://en.wikipedia.org/wiki/Operon#cite_ref-1">^</a></strong> Salgado, H; Moreno-Hagelsieb, G; Smith, T. F.; Collado-Vides, J. Operons in Escherichia coli: Genomic analyses and predictions. <em>PNAS.</em> <strong>2000</strong>, <em>97</em>, 6652-6657. <a class="external autonumber" title="http://www.pnas.org/cgi/content/full/97/12/6652" rel="nofollow" href="http://www.pnas.org/cgi/content/full/97/12/6652" rel="nofollow">[1]</a> </li>
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