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MALDI-TOF MS spectra of whole-cell extracts of C. upsaliensis reference strains. Spectra for reference strains representative of SIBI types 1, 2, 3, and 4 were obtained with C. upsaliensis strains RM2092 (A), RM3776 (B), RM3195 (C), and RM4245 (D), respectively. The relative intensities of the ions are shown on the y axis, and the masses (in Da) of the ions are shown on the x axis. The SIBI types are designated above the singly charged ion for each strain.
