Table 2 SAMD9 and SAMD9L likelihood ratio test (LRT) for four site models from PAML software

Null Hypothesis

Alternative Hypothesis

−2ΔlnL

df

p-Value

Site Models

SAMD9

M1: nearly neutral

M2: positive selection

25.55

2

< 0.001***

M7: beta

M8: beta and ω > 1

77.76

2

< 0.001***

SAMD9L

M1: nearly neutral

M2: positive selection

51.10

2

< 0.001***

M7: beta

M8: beta and ω > 1

97.44

2

< 0.001***