TABLE 9.

Selection pressures acting on IS607 orfA: ML parameter estimates^a

Model	lnL	dN/dS	Estimates of parameters	LRT (df)	χ2	P	Positively selected sites (ω > 1)
M0 (one ratio)	−1,393.247	0.207	ω = 0.207				None
M1 (neutral)	−1,385.371	0.246	p0 = 0.753, ω0 = 0; p1 = 0.246, ω1 = 1				Not allowed
M2 (selection)	−1,384.631	0.206	p0 = 0.673, p1 = 0.119; (p2 = 0.207), ω2 = 0.41	M0 vs M2 (2)	17.232	<0.000	None
M1 vs M2 (2)	1.48	NSb
M3 (discrete)	−1,384.77	0.208	p0 = 0.115, ω0 = 0.0001; p1 = 0.62, ω1 = 0.01; p2 = 0.26, ω2 = 0.76	M0 vs M3 (4)	16.954	<0.001	None
M1 vs M3 (4)	1.202	NS
				M2 vs M3 (2)	−0.278	NS
M7 (β)	−1,384.701	0.208	p = 0.086, q = 0.329				Not allowed
M8 (β and ω)	−1,384.483	0.217	p0 = 0.98; p = 0.144, q = 0.638; p2 = 0.011, ω2 = 3.059	M7 vs M8 (2)	0.138	NS	None

^aSee Table 7 footnotes.

^bNS, not significant.