lossterm">gamma parameter</a><script type="text/javascript">//<![CDATA[
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//]]></script><span class="glosstext" id="POPUP26680" style="display: none;"> According to the gamma distribution, the substitution rate often varies from site to site within a sequence.  The shape of this distribution is determined by a value known as the gamma parameter, which is also known as the shape parameter.</span></span></u><span 
	 style="display: none;">RH_Gamma_parameter</span><sp