1PPV:
reference: A crystallographic investigation of phosphoantigen binding to isopentenyl pyrophosphate/dimethylallyl pyrophosphate isomerase., Wouters J, Yin F, Song Y, Zhang Y, Oudjama Y, Stalon V, Droogmans L, Morita CT, Oldfield E, J Am Chem Soc 2005 Jan 19;127(2):536-7. PMID: 15643873

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