CodY regulates exoprotein production. SDS-PAGE gel analysis of 1) molecular weight standards and exoproteins isolated from 2) wild-type and 3) codY mutant strains of S. pyogenes. Open circles are adjacent to protein bands excised from the gel and numbers to the right of the gel designate the sample which was analyzed with by MS/MS. The protein with the highest score (and in some cases the protein with the 2nd highest score) is indicated to the right of the gel image. The sizes (kDa) of molecular weight standards are shown to the left of the gel image. Additional information related to the MS/MS analyses is presented in Additional file 1: Table S1, Additional file 2: Table S2.