1Q0X:
reference: Anchoring a cationic ligand: the structure of the Fab fragment of the anti-morphine antibody 9B1 and its complex with morphine., Pozharski E, Wilson MA, Hewagama A, Shanafelt AB, Petsko G, Ringe D, J Mol Biol 2004 Mar 26;337(3):691-7. PMID: 15019787

This OCA Structure page
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