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Beta-Lactamase
Definition 1
An enzyme that brings about the hydrolysis of a beta-lactam (as penicillin to penicilloic acid); found in most staphylococcus strains that are naturally resistant to penicillin. (NCI Thesaurus)
Definition 2
A beta-lactamase preferentially cleaving penicillins. (Dorland, 28th ed) EC 3.5.2.-. (NLM, Medical Subject Headings)
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