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Deconvoluted mass spectra of FOX-4 β-lactamase with inhibitors in variable ratios (in parentheses). Mass increases (products of inactivation) are shown for (a) FOX-4 β-lactamase with ertapenem, (b) FOX-4 with meropenem, (c) FOX-4 with doripenem and (d) FOX-4 with imipenem. All measurements have an error of ±5 amu.
