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  • Enzymes
  • Catalyitic triads are most commonly found in hydrolase and transferase enzymes (e.g. proteases, amidases, esterases, acylases, lipases and β-lactamases). (wikipedia.org)
  • chemical
  • Semi-synthetic penicillins and cephalosporins both derive from their respective chemical nuclei, 6-aminopenicillanic acid (6-APA) and 7-aminocephalosporanic acid (7-ACA). (nih.gov)