Table 1. Branch model parameters for 5′ HoxA and HoxD genes.

Gene	Model	ω0	ωC	2Δℓ	P value
Hoxa9	One-ratio (ω0)	0.0483	= ω0
	Two-ratio (ω0, ωC)	0.0483	0.0993	0.3076	0.5791
Hoxa10	One-ratio (ω0)	0.0863	= ω0
	Two-ratio (ω0, ωC)	0.0863	0.2286	0.4007	0.5267
Hoxa11	One-ratio (ω0)	0.0675	= ω0
	Two-ratio (ω0, ωC)	0.0675	0.4016	0.0002	0.9885
Hoxa13	One-ratio (ω0)	0.0136	= ω0
	Two-ratio (ω0, ωC)	0.0136	0.0001	0.3530	0.5524
Hoxd9	One-ratio (ω0)	0.1073	= ω0
	Two-ratio (ω0, ωC)	0.1073	0.1558	0.0596	0.8071
Hoxd10	One-ratio (ω0)	0.1230	= ω0
	Two-ratio (ω0, ωC)	0.1230	0.0001	0.6032	0.4374
Hoxd11	One-ratio (ω0)	0.0712	= ω0
	Two-ratio (ω0, ωC)	0.0712	0.3839	5.28	0.0215*
Hoxd12	One-ratio (ω0)	0.1050	= ω0
	Two-ratio (ω0, ωC)	0.1050	0.0001	1.0701	0.3009
Hoxd13	One-ratio (ω0)	0.0417	= ω0
	Two-ratio (ω0, ωC)	0.0417	0.0001	0.7609	0.3830

ω_C is for the common ancestor of Cetruminantia in Figure 2 (the foreground branch). ω₀ is for all other branches (the background branches). *, P value of Hoxd11 is significant (<0.05). Significantly different ω values for Hoxd11 are shown in bold.