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Table 2 The number of G protein-coupled receptors predicted in the Rhodopsin families/subfamilies of Ciona in comparison with the human genome

From: The repertoire of G protein-coupled receptors in the sea squirt Ciona intestinalis

Receptor

Human*

Ciona

Rhodopsin(α)

  

Prostaglandin

15

2

Amine

40

8

Opsins l

9

3

Melatonin

3

3

MECA

22

5

Unclassified amine

-

6

Unclassified Opsin-like

-

3

Unclassified EDG/CNR-like

-

1

TRE1/GPR84

1

3

Rhodopsin (β)

  

Peptide

43

9

Unclassified peptide

-

1

Rhodopsin (γ)

  

SOG

15

1+0+2

MCHR

2

-

Chemokine cluster

42

2

Unclassified Chemokine receptor cluster-like

-

12

Rhodopsin (δ)

  

MAS

8

-

LGR-like/GLHR

8

2+1

LDLRR

-

15

Unclassified LGR-like

-

14

Purine

42

-

Olfactory

388

-

Other Rhodopsins

23

23

  1. * Numbers and abbreviations are as described in [5, 8].