1NHP:
reference: Crystallographic analyses of NADH peroxidase Cys42Ala and Cys42Ser mutants: active site structures, mechanistic implications, and an unusual environment of Arg 303., Mande SS, Parsonage D, Claiborne A, Hol WG, Biochemistry 1995 May 30;34(21):6985-92. PMID: 7766608

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