Figure 2. Agarose gel electrophoresis of PCR products of amplified cdt-genes in serotypes a through f isolates of A. actinomycetemcomitans, including a serotype a isolate (612), which was negative for detection of the cdtABC cluster, but positive for detection of the individual cdt genes.
Size of the cdt gene cluster cdtABC, cdtA, cdtB, cdtC: 2105, 693, 862, 592 bp (base pair), respectively.