Detection of MexA, OprM, MexX, MexC, and OprJ by immunoblot analysis with the appropriate antibodies. Lane 1, KG2504; lane 2, KG2504F1; lane 3, KG2505; lane 4, KG2505F1; lane 5, KG2505F1ΔD; lane 6, positive controls (KG5004 for MexA and OprM, KG5006 for MexX, and KG5008 for MexC and OprJ).