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The reaction schemes catalyzed by PGA and CA. PGA: penicillin G acylase; CA: cephalosporin acylase; PG: penicillin G; PAA: phenylacetic acid; 6-APA: 6-aminopenicillanic acid; GL-7-ACA: glutaryl-7-aminocephalosporanic acid; 7-ACA: 7-aminocephalosporanic acid.
