Adaptive Evolution of MRG, a Neuron-Specific Gene Family Implicated in Nociception

Table 1.

Likelihood Estimates of Different Evolutionary Models

Evolutionary model	# of parameters	Ω estimate (frequency of sites) ^a	Log likelihood
One-ratio model (MO)	13	ω = 0.93 (100%)	−2910.02
Neutral model (M1)	13	ω₁ = 0.00 (31%)	−2891.93
		ω₂ = 1.00 (69%)
Selection model (M2)	15	ω₁ = 0.00 (27%)	−2876.49
		ω₂ = 1.00 (60%)
		ω₃ = 4.91 (13%) ^b