Sawzdargo M, Nguyen T, Lee DK, Lynch KR, Cheng R, Heng HH, George SR, O'Dowd BF (1999). „Identification and cloning of three novel human G protein-coupled receptor genes GPR52, PsiGPR53 and GPR55: GPR55 is extensively expressed in human brain”. Brain Res Mol Brain Res. 64 (2): 193—8. PMID9931487. doi:10.1016/S0169-328X(98)00277-0.
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Sawzdargo M, Nguyen T, Lee DK, Lynch KR, Cheng R, Heng HH, George SR, O'Dowd BF (1999). „Identification and cloning of three novel human G protein-coupled receptor genes GPR52, PsiGPR53 and GPR55: GPR55 is extensively expressed in human brain”. Brain Res Mol Brain Res. 64 (2): 193—8. PMID9931487. doi:10.1016/S0169-328X(98)00277-0.