Electrophoresis of representative samples with different CagA EPIYA patterns. DNA from representative clinical samples from cagA-positive H. pylori patients (E, F, G, H) was amplified by EPIYA motif-specific PCR. The PCR products were analyzed on a 1.5% agarose gel. Column 1: 100 bp MW marker; E (columns 2–4) EPIYA-ABC; F (columns 5–7) EPIYA-ABCC; G (columns 11–13) EPIYA-ABBC; H (columns 14–16) EPIYA-ABBCCC. DNA from the H. pylori 43504 strain, which contains the EPIYA-ABCCC motif, was used as a positive control. Size of products of EPIYA motifs by PCR-specific: EPIYA A motif (~264 bp), EPIYA B (~306 bp ), second EPIYA B motif (500 bp), first EPIYA C (501 PB) second EPIYA C motif (~650 bp) and third EPIYA-C (>650 bp).