4IVI:
reference: Structural basis for the beta-lactamase activity of EstU1, a family VIII carboxylesterase., Cha SS, Jun An Y, Jeong CS, Kim MK, Jeon JH, Lee CM, Lee HS, Gyun Kang S, Lee JH, Proteins. 2013 Jun 5. doi: 10.1002/prot.24334. PMID: 23737193

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