Table 1. Significant selection divergence in three vision genes between giraffe or okapi (Clade 1) against the background of ruminant species (Clade 0).

	Giraffe							Okapi
	lnL			Site classes				lnL		Site classes
Gene	M2a_rel	CmC	LRT	0	1	2	P-value	CmC	LRT	0	1	2	P-value
CRYAA	−936.5	−933.8	5.3	P0 = 0.9  ω0 = 0.0	P1 = 0.0  ω1 = 1	P2 = 0.1  ωClade0 = 1.4  ωClade1 = 0.0	0.02	−935.1	2.8	P0 = 0.9  ω0 = 0.0	P1 = 0.0  ω1 = 1	P2 = 0.1  ωClade0 = 1.2  ωClade1 = 0.0	0.09
SAG	−2177.5	−2176.8	1.6	P0 = 0.4  ω0 = 0.05	P1 = 0.1  ω1 = 1	P2 = 0.5  ωClade0 = 0.5  ωClade1 = 0.2	0.2	−2175.5	4.1	P0 = 0.95  ω0 = 0.08	P1 = 0.0  ω1 = 1	P2 = 0.05  ωClade0 = 0.0  ωClade1 = 2.3	0.04
OPN1LW	−1780.6	−1778.2	4.7	P0 = 0.96  ω0 = 0.0	P1 = 0.03  ω1 = 1	P2 = 0.01  ωClade0 = 0.0  ωClade1 = 339.6	0.03	−1780.2	0.7	P0 = 0.95  ω0 = 0.0	P1 = 0.0  ω1 = 1	P2 = 0.05  ωClade0 = 0.9  ωClade1 = 0.0	0.4