Figure 4.
Nonsynonymous substitution per nonsynonymous site (K a) vs. years of divergent evolution. The values for K a are listed in Table 2, and the years of divergent evolution (2T) are as per Sibley and Ahlquist (1984). Common name for each genus/species are as listed in the legend to Fig. 2. BothK a and 2T for the Old World monkeys M. mulatta and P. hamadryas are identical and are thus represented by a single point. The slope of the line representing a best fit through these data points is 0.40 × 10−9ns/ns/yr, with a correlation coefficient (r 2) of 0.93.
