1JOQ:
reference: Solution structures of staphylococcal nuclease from multidimensional, multinuclear NMR: nuclease-H124L and its ternary complex with Ca2+ and thymidine-3',5'-bisphosphate., Wang J, Truckses DM, Abildgaard F, Dzakula Z, Zolnai Z, Markley JL, J Biomol NMR 1997 Sep;10(2):143-64. PMID: 9369015

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