Key points are not available for this paper at this time.
Nearly 2000 G protein-coupled receptors (GPCRs)1 have been reported since bovine opsin was cloned in 1983 (1) and the β-adrenergic receptor in 1986 (2). They are classified into over 100 subfamilies according to the sequence homology, ligand structure, and receptor function. A substantial degree of amino acid homology is found among members of a particular subfamily, but comparisons between subfamilies show significantly less or no similarity.
Ji et al. (Wed,) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: