Comparison of the AatA proteins of IMT5155, APEC_O1, BL21, and B_REL606. AatA amino acid sequences were compared using MegAlign (Lasergene 6, DNASTAR, WI, USA). Proteins are depicted as schemes indicating specific protein domains as predicted (SP: signal peptide; ATr: autotransporter repeat region; PD: passenger domain; TD: transmembrane domain). Amino acid differences are shown as lines. Red lines indicate differences to the IMT5155-AatA amino acid sequence. The total number of amino acid substitutions is given for each protein domain below the protein schemes.