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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].