Structural features of the boaA and boaB gene products. Different regions of the predicted B. mallei ATCC23344 BoaA (A), B. pseudomallei K96243 BoaA (B) and B. pseudomallei K96243 BoaB (C) proteins are depicted with the positions of residues defining selected domains. The horizontal brackets outline selected regions of the BoaA and BoaB proteins and the percent identity between these regions is shown below the brackets. Transporter modules (OM anchors) and helical linkers were identified using the PSIPRED secondary structure prediction algorithm. The colored boxes show the relative position and number of repeated SLST motifs.