PCR confirmation of the rpoN, fliA, and flgR mutants of C. jejuni NCTC 11168. Lanes: 1 and 8, 1-kb DNA marker; 2 and 3, rpoN PCR amplification products in the wild type and mutant, respectively; 4 and 5, fliA PCR products in the wild type and mutant, respectively; 6 and 7, flgR PCR products in the wild type and mutant, respectively.