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. 2014 May;80(9):2928–2940. doi: 10.1128/AEM.04058-13

FIG 3.

FIG 3

(A) MS data for bacterial cell lysate of E. coli O104:H4 (German outbreak strain) grown on LBA with no antibiotic. (B) MS data for bacterial cell lysate of E. coli O104:H4 grown on LBA supplemented with ciprofloxacin. The peak at m/z 7820 is the B subunit of Stx2. (C) MS data for bacterial cell lysate of E. coli O104:H4 grown on LBA supplemented with ciprofloxacin, digested with furin, and disulfide reduced. The peaks at m/z 7821 and m/z 5291 are the B subunit and A2 fragment of Stx2, respectively.