Changes

<p><span style="color:rgb(37,37,37); font-family:sans-serif; font-size:14px">In&nbsp;</span><a href="http://en.wikipedia.org/wiki/Molecular_genetics" style="font-size: 14px; text-decoration: none; font-family: sans-serif; background-image: none; color: rgb(11,0,128); line-height: 22px" title="Molecular genetics">molecular genetics</a><span style="color:rgb(37,37,37); font-family:sans-serif; font-size:14px">, an&nbsp;</span><strong>untranslated region</strong><span style="color:rgb(37,37,37); font-family:sans-serif; font-size:14px">&nbsp;(or&nbsp;</span><strong>UTR</strong><span style="color:rgb(37,37,37); font-family:sans-serif; font-size:14px">) refers to either of two sections, one on each side of a&nbsp;</span><a class="mw-redirect" href="http://en.wikipedia.org/wiki/Coding_sequence" style="font-size: 14px; text-decoration: none; font-family: sans-serif; background-image: none; color: rgb(11,0,128); line-height: 22px" title="Coding sequence">coding sequence</a><span style="color:rgb(37,37,37); font-family:sans-serif; font-size:14px">&nbsp;on a strand of&nbsp;</span><a class="mw-redirect" href="http://en.wikipedia.org/wiki/MRNA" style="font-size: 14px; text-decoration: none; font-family: sans-serif; background-image: none; color: rgb(11,0,128); line-height: 22px" title="MRNA">mRNA</a><span style="color:rgb(37,37,37); font-family:sans-serif; font-size:14px">. If it is found on the 5&#39; side, it is called the&nbsp;</span><a href="http://en.wikipedia.org/wiki/Five_prime_untranslated_region" style="font-size: 14px; text-decoration: none; font-family: sans-serif; background-image: none; color: rgb(11,0,128); line-height: 22px" title="Five prime untranslated region">5&#39; UTR</a><span style="color:rgb(37,37,37); font-family:sans-serif; font-size:14px">&nbsp;(or&nbsp;</span><strong>leader sequence</strong><span style="color:rgb(37,37,37); font-family:sans-serif; font-size:14px">), or if it is found on the 3&#39; side, it is called the&nbsp;</span><a href="http://en.wikipedia.org/wiki/Three_prime_untranslated_region" style="font-size: 14px; text-decoration: none; font-family: sans-serif; background-image: none; color: rgb(11,0,128); line-height: 22px" title="Three prime untranslated region">3&#39; UTR</a><span style="color:rgb(37,37,37); font-family:sans-serif; font-size:14px">&nbsp;(or&nbsp;</span><strong>trailer sequence</strong><span style="color:rgb(37,37,37); font-family:sans-serif; font-size:14px">).</span></p>

<p><strong>Polyadenylation</strong><span style="color:rgb(37,37,37); font-family:sans-serif; font-size:14px">&nbsp;is the addition of a&nbsp;</span><strong>poly(A) tail</strong><span style="color:rgb(37,37,37); font-family:sans-serif; font-size:14px">&nbsp;to a&nbsp;</span><a class="mw-disambig" href="http://en.wikipedia.org/wiki/Messenger" style="font-size: 14px; text-decoration: none; font-family: sans-serif; background-image: none; color: rgb(11,0,128); line-height: 22px" title="Messenger">messenger</a><span style="color:rgb(37,37,37); font-family:sans-serif; font-size:14px">&nbsp;</span>RNA<span style="color:rgb(37,37,37); font-family:sans-serif; font-size:14px">.&nbsp;</span><span style="color:rgb(37,37,37); font-family:sans-serif; font-size:14px">The poly(A) tail is important for the nuclear export, translation, and stability of mRNA. The tail is shortened over time, and, when it is short enough, the mRNA is enzymatically degraded.</span></p>