Fig. 1From: Helicobacter pylori vacA s1m1 genotype but not cagA or babA2 increase the risk of ulcer and gastric cancer in patients from Southern MexicoOligonucleotides specificity used in the PCR for 16S rRNA gene and vacA s2, m2 alleles of H. pylori. a Amplification of 522 bp fragment of the 16S rRNA gene of H. pylori. Lane 1 1 kb plus molecular weight marker; lane 2 negative control; lane 3 H. pylori strain ATCC43504; lane 4 Staphylococcus aureus strain; lane 5 Escherichia coli strain; lane 6 Campylobacter sp strain; lanes 7 and 8 unidentified bacteria strains isolated from gastric biopsies. b, c PCR amplification products of vacA alleles, s2 (b) and m2 (c). Lanes 3 H. pylori strain 26695 (vacA s1m1); lanes 4 H. pylori strain 8822 (vacA s2m2); lanes 5 H. pylori strain Tx30 (vacA s2m2); lanes 6 DNA of clinical strain HG-182 with vacA s2m2 genotype isolated from a patient with antral chronic gastritis on March 10th, 2014 and lanes 7 H. pylori vacA s2m2 in DNA from gastric biopsy UEGE-111 obtained from a patient with chronic gastritis on November 10th, 2007 (In this patient, the same genotype was detected in another biopsy taken on April 24th, 2007); lbanes 8 b and c, emptyBack to article page