Figure 7
Relative strength of selective pressure on RecQ helicases and their partners. The number of nonsynonymous (amino acid altering) nucleotide substitutions per nonsynonymous sites (d N ) plotted against the number of synonymous nucleotide substitutions per synonymous sites (d S ) are plotted for RecQ genes and their partners. The dashed line indicates the neutral expectations (i.e., d N = d S ); values below the dashed line indicate purifying selection is in operation, as reflected by d S > d N .