1KSZ:
reference: Entrapment of 6-thiophosphoryl-IMP in the active site of crystalline adenylosuccinate synthetase from Escherichia coli., Poland BW, Bruns C, Fromm HJ, Honzatko RB, J Biol Chem 1997 Jun 13;272(24):15200-5. PMID: 9182542

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