1SUP:
reference: Subtilisin BPN' at 1.6 A resolution: analysis for discrete disorder and comparison of crystal forms., Gallagher T, Oliver J, Bott R, Betzel C, Gilliland GL, Acta Crystallogr D Biol Crystallogr. 1996 Nov 1;52(Pt 6):1125-35. PMID: 15299573

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