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. 2005 Sep 16;1(3):e35. doi: 10.1371/journal.pgen.0010035

Figure 2. Variable Selective Pressure is Seen Between Lineages for Semen Coagulum Protein TGM4.

Figure 2

This primate phylogeny shows selective pressure on TGM4 with estimated d N/d S ratios indicated on branches. Ratios greater than one are suggestive of either relaxed constraint or positive selection. Ratios are only shown for long branches, those with at least eight substitutions. A null model with a uniform d N/d S ratio across all lineages is rejected in favor of these estimates (p = 0.003). Branch lengths are estimated from TGM4 coding sequences. NWM, New World monkeys; OWM, Old World monkeys.