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Comparative study (using cefepime as the substrate) of the specific activity of β-lactamase VEB-1 from cultures of E. coli DH10B (left panel) and P. aeruginosa KG2505 (right panel) strains harboring recombinant plasmids. Error bars represent standard deviations calculated from five independent cultures. No measurable activity was detected for E. coli DH10B(pVEB) and for E. coli DH10B(p1999L-VEB).
