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Table 2 Likelihood ratio test (LRT) of functional divergence for each duplicate event of the VFTMs.

From: Evolution of the class C GPCR Venus flytrap modules involved positive selected functional divergence

Group 1

Group 2

Duplicate event

θ ± S.E.(ML)

LRT

P

mGluR

GB1

I

0.787 ± 0.109

52.076

<0.01

mGluR

GB2

I

0.737 ± 0.101

53.163

<0.01

CaSR

GB1

I

0.650 ± 0.141

21.342

<0.01

CaSR

GB2

I

0.906 ± 0.132

47.410

<0.01

T1R

GB1

I

0.826 ± 0.147

31.777

<0.01

T1R

GB2

I

0.915 ± 0.127

51.798

<0.01

mGluR

CaSR

II

0.338 ± 0.106

10.241

<0.01

mGluR

T1R

II

0.446 ± 0.055

66.438

<0.01

CaSR

T1R

III

0.001 ± 0.022

0.292

NS

GB1

GB2

III

0.384 ± 0.123

5.686

NS

  1. I, II and III represent the first, second and third duplication events, ML and S.E. stand for maximum likelihood and standard error, respectively. The p values are the critical value of χ2 distribution with df = 1 (degree of freedom). NS means not significant at 1% level.