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Nguyen T, Shapiro DA, George SR, Setola V, Lee DK, Cheng R, Rauser L, Lee SP, Lynch KR, Roth BL, O'Dowd BF, Discovery of a novel member of the histamine receptor family (abstract), in Mol. Pharmacol., vol. 59, n. 3, 2001, pp. 427–33, PMID11179435. URL consultato il 24 dicembre 2013 (archiviato dall'url originale il 7 ottobre 2008).