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Identification of the KPC producer by using the KPC peak at 28718 m/z. Mass spectra were obtained from the lysates of drug-susceptible (upper) and carbapenem-resistant (bottom) E. coli conferred by the KPC-2 enzyme. A KPC peak is presented near the theoretical molecular weight of the KPC-2 polypeptide, with the gray vertical line, at 28718.13 m/z.
