FIG. 4.

Association of O antigen production with the absence of an insertion element in the O antigen biosynthesis gene cluster of strain K56-2. (A) LPS electrophoretic profiles for B. cenocepacia ET12 strains. Samples were run in 14% polyacrylamide gels in a Tricine-SDS system and developed by silver staining. (B) PCR amplification experiment to investigate the presence of IS402 interrupting the wbxE gene on B. cenocepacia in ET12 strains. Amplified products were run in a 0.7% agarose gel. M, 1-kb DNA ladder.