Table 1.

BDS Statistics in Eight Eukaryotic Species.

	Divergent Regions		Nondivergent Regions		Branch
Species	W→S	Not W→S	W→S	Not W→S	Length	BDS	P value
Human	0.445	0.555	0.425	0.575	0.01	0.12	≈0
Mouse	0.419	0.581	0.415	0.585	0.17	0.02	5.2 × 10−5
Dog	0.512	0.488	0.423	0.577	0.20	0.52	≈0
Chicken	0.392	0.608	0.401	0.599	0.34	−0.05	5.3 × 10−6
Stickleback	0.439	0.561	0.418	0.582	0.43	0.13	≈0
Fruit fly	0.297	0.703	0.270	0.730	0.13	0.19	≈0
Worm	0.311	0.689	0.295	0.705	0.81	0.11	5.1 × 10−5
Yeast	0.426	0.574	0.442	0.558	0.25	−0.10	5.8 × 10−7

NOTE.—BDS is a log odds ratio quantifying the association between W→S substitution and the density of substitution. P values are computed using FET. Branch lengths are given in expected substitutions per site. All statistics are based on a cluster size of 1,000 bp and a density threshold that results in approximately 5% of substitutions being placed in the divergent class.