3PVA:
reference: Penicillin V acylase crystal structure reveals new Ntn-hydrolase family members., Suresh CG, Pundle AV, SivaRaman H, Rao KN, Brannigan JA, McVey CE, Verma CS, Dauter Z, Dodson EJ, Dodson GG, Nat Struct Biol 1999 May;6(5):414-6. PMID: 10331865

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