lternatively, 
 once the <a href="javascript:TextPopup(this)" id="HotSpot26142" class="glossterm">codon</a><script type="text/javascript">//<![CDATA[
TextPopupInit('HotSpot26142', 'POPUP26142');
//]]></script><span class="glosstext" id="POPUP26142" style="display: none;"> A codon is triplet of nucleotides that codes for a specific amino acid.</span> has been 
 selected, type in the first letter of the name of the amino acid and the 
 program will jump to that part of the list. To indicate a stop codon, 
 se