Fig. 2From: Prevalence of pks-positive Escherichia coli in Japanese patients with or without colorectal cancerConventional qualitative PCR to detect clbB, clbQ, and clbA genes from nine DNA samples derived from nine different E. coli strains. N negative control for clbB gene (derived from str. K-12 substr. MG1655), P positive control for clbB gene (referred to in the “Methods” section)Back to article page