Single-nucleotide variation. A scatter plot of genetic distances (changes/bp) determined from nonoverlapping 3-kb sliding windows for human–chimpanzee (51 loci, 5.0 Mb, 9684 windows), human–baboon (42 loci, 5.0 Mb, 8893 windows), and human–lemur (9 loci, 0.62 Mb, 841 windows) sequence alignments. These were plotted against human divergence times of 5.5, 25, and 55 Mya for chimpanzee, baboon, and lemur alignments, respectively. Suboptimal alignments were excluded. The means and their standard deviations are shown.