Table 3.

Parameters estimation and likelihood ratio tests for the branch-site and free-ratio models among Arabidopsis MATE genes

Cluster	Model	npa	lnL	2⊿l	Positive selected sitesb
AtMATE I	Model A-null	114	−52052.69		Not allowed
	Model A	115	−52042.81	19.74**	9
AtMATE II	Model A-null	114	−52013.53		Not allowed
	Model A	115	−51982.21	62.64**	32
AtMATE III	Model A-null	114	−52053.21		Not allowed
	Model A	115	−52046.24	13.92**	6
AtMATE IV	Model A-null	114	−52053.82		Not allowed
	Model A	115	−52050.76	6.11*	none
Not allowed	M0: one-ratio	112	−52264.45		none
	Mf: free-ratio	221	−52043.51	441.86**	Not allowed

Note: p < 0.05 were marked by *, p < 0.01 were marked by **

^aNumber of parameters in the ω distribution

^bThe numbers of Positive-selection sites are inferred at posterior probabilities > 95 %