Table 2.

Summary of results of tests of selection on human genes

Test	Significance threshold	Number of genesa
Model A versus Model Anull	0.05	244
[strict branch + site test]	0.01	152
	0.001	48
Model A versus Model 1a	0.05	611
[relaxed branch + site test]	0.01	276
	0.001	114
Model H versus Model Hnull	0.05	16
[strict branch test]	0.01	3
	0.001	2

^aOR5B3 is the only gene with P < 0.05 in both branch (Model H versus Model Hnull) and branch + site (Model A versus Model Anull) tests.