ecies, populations, individuals, or sequences within an individual.</span></u><span style="display: none;">RH_Groups_of_taxa</span> and is 
 enabled only if at least two groups of <a href="javascript:TextPopup(this)" id="HotSpot55869" class="glossterm">taxa</a><script type="text/javascript">//<![CDATA[
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//]]></script><span class="glosstext" id="POPUP55869" style="display: none;"> A taxon is the individual unit whose evolutionary relationship is being investigated.