7209');
//]]></script><span class="glosstext" id="POPUP7209" style="display: none;"> A transition occurs when a purine is substituted by a purine, or a pyrimidine by a pyrimidine.</span></u><span 
	 style="display: none;">RH_Transition</span>al and <u style="text-decoration: none; "><a href="javascript:TextPopup(this)" id="HotSpot21483" class="glossterm">transversion</a><script type="text/javascript">//<![CDATA[
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//]]></script><span class="glosstext" id="POPUP2148