1H2G:
reference: Mutations of penicillin acylase residue B71 extend substrate specificity by decreasing steric constraints for substrate binding., Morillas M, McVey CE, Brannigan JA, Ladurner AG, Forney LJ, Virden R, Biochem J. 2003 Apr 1;371(Pt 1):143-50. PMID: 12511194

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