Positive Selection of Squalene Synthase in Cucurbitaceae Plants

Table 3

Parameter estimation and likelihood ratio tests for the branch model.

Model		Estimates of parameters		LRT pairs		2∆lnL		Positively selected sites (BEB)
Model 0: one ratio	112		-29891.94
		Free model							221		-29765.91	M0/free model	109	252.06	0.001	None

Selection analysis by a specific free model was performed using CodeML implemented in PAML. lnL: loglikelihood; LRT: likelihood ratio test. ωa, ωb, ωc, ωd, ωe, and ωf represent the branches that .