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Transmembrane (TM) helices of human D1-like dopaminergic receptors (hD1R and hD5R) harbor the same residues implicated in ligand binding and activation of catecholamine G protein-coupled receptors (GPCRs). Yet, hD1R and hD5R naturally display the distinct functional properties shared by wild type and constitutively active mutant GPCRs, respectively. Interestingly, we show in the present study that...