4B88:
reference: Hyperstability and Substrate Promiscuity in Laboratory Resurrections of Precambrian beta-Lactamases., Risso VA, Gavira JA, Mejia-Carmona DF, Gaucher EA, Sanchez-Ruiz JM, J Am Chem Soc. 2013 Feb 14. PMID: 23394108

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