1GLO:
reference: Structure of a Cys25-->Ser mutant of human cathepsin S., Turkenburg JP, Lamers MB, Brzozowski AM, Wright LM, Hubbard RE, Sturt SL, Williams DH, Acta Crystallogr D Biol Crystallogr 2002 Mar;58(Pt 3):451-5. PMID: 11856830

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