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This set contains 'orphan' G protein coupled receptors where the endogenous ligand(s) is not known.
Database page citation:
Orphan and other 7TM receptors. Accessed on 06/05/2025. IUPHAR/BPS Guide to PHARMACOLOGY, http://www.guidetopharmacology.org/GRAC/FamilyDisplayForward?familyId=115.
Concise Guide to PHARMACOLOGY citation: