Sequence comparison of boaA and boaB gene products. The last 93 residues of selected boaA and boaB gene products are shown with the positions of the aa defining these regions in parentheses. Perfectly conserved aa are shown in black text over white background. Residues unique to BoaA proteins are shown in blue text over a yellow background. Residues unique to BoaB proteins are shown in white text over a blue background. Bm = B. mallei, Bp = B. pseudomallei.