Table 2.

Selection pressure (dN/dS) of npyr genes in vertebrates (p  ≤ 0.05).

Gene	dN/dS	No. of positive sites	No. of negative sites
npy1r	0.120	0	20
npy2r	0.189	0	92
npy4r	0.180	0	33
npy7r	0.154	0	68
npy8ar	0.0916	0	91
npy8br	0.0988	0	75