Western immunoblot probed with antiserum specific for OprD (5) of P. aeruginosa strain H729 oprD::Kmr containing the following plasmids or standards: pHP23 (lane 1), pHP22 (lane 2), pHP21 (lane 3), pHP2 (lane 4), pXH2 (lane 5), vector control pUCP18 (lanes 6 and 8), chromogenic molecular weight standards (lane 7), pXH3 (lane 9), and pXH12 (lane 10).