Fig 2 -

Top panel: MS of sample supernatant of E. coli O113:H21 strain RM7806 cultured overnight on LBA. Middle panel: MS of sample supernatant of strain cultured overnight on LBA supplemented with 400 ng/mL of MMC. Bottom panel: MS of sample supernatant of strain cultured overnight on LBA supplemented 600 ng/mL of MMC. Prominent protein ions are identified by the mass-to-charge (m/z) ratio. Integrated peak areas (underlined) are provided below the m/z. Expanded m/z are provided by inserts. Conserved proteins ions are labeled on the basis of previous identifications in other E. coli strains. Protein ions marked with an asterisk are MALDI matrix adducts. Protein ions marked with a star were analyzed by MS/MS in the current work. Protein ions marked with an X were analyzed by MS/MS, but the data was not of sufficient quality for an identification.