Table 1 The number of GPCR genes in human, dog, mouse and rat.

Adhesion

37

1

33

30

30

Frizzled

11

0

11

11

10

Glutamate

22

0

22

22

22

Rhodopsin non-olfactory

267

12

284

320

297

Secretin

15

0

15

15

15

Taste 2

14^#

5^#

25^§

35^§

35^§

V1R

8*

33*

5*

187*

106*

V2R

0*

9*

0*

121*

79*

Other GPCRs

18

0

18

19

19