Table 4.

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

Cluster	Model	npa	lnL	2⊿l	Positive selected sitesb
OsMATE I	Model A-null	92	−32162.29		Not allowed
	Model A	93	−32157.88	8.82**	2
OsMATE II	Model A-null	92	−32161.05		Not allowed
	Model A	93	−32158.60	4.90**	3
OsMATE III	Model A-null	92	−32155.71		Not allowed
	Model A	93	−32149.67	12.08**	115
OsMATE IV	Model A-null	92	−32161.59		Not allowed
	Model A	93	−32154.39	14.4**	7
Not allowed	M0: one-ratio	90	−32415.33		none
	Mf: free-ratio	177	−32148.55	533.56**	Not allowed

Note: 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 %