1FWI:
reference: Characterization of the mononickel metallocenter in H134A mutant urease., Park IS, Michel LO, Pearson MA, Jabri E, Karplus PA, Wang S, Dong J, Scott RA, Koehler BP, Johnson MK, Hausinger RP, J Biol Chem 1996 Aug 2;271(31):18632-7. PMID: 8702515

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