">//<![CDATA[
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//]]></script><span class="glosstext" id="POPUP36301" style="display: none;"> A taxon is the individual unit whose evolutionary relationship is being investigated.  Depending on the study, “taxa” may refer to species, populations, individuals, or sequences within an individual.</span>, it becomes very difficult to examine all topologies.</p>
<p>In the case of the NJ method, the <i>S</i> value is not computed for all or many topologies, but the e