1FBY:
reference: Crystal structure of the human RXRalpha ligand-binding domain bound to its natural ligand: 9-cis retinoic acid., Egea PF, Mitschler A, Rochel N, Ruff M, Chambon P, Moras D, EMBO J 2000 Jun 1;19(11):2592-601. PMID: 10835357

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