Fig. 1
From: Prevalence of pks-positive Escherichia coli in Japanese patients with or without colorectal cancer
Conventional qualitative PCR to detect various amounts of pks-positive control E. coli DNA using primers for clbB (top) and uidA (bottom) genes. 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); numerals, amount (pg/sample) of pks-positive E. coli DNA. Samples containing 0.1 pg or more of pks-positive control DNA tested positive