Polymerase chain reaction (PCR) amplification and hybridization of biopsy samples. A) PCR products of the 109-bp fragment of 16S rRNA obtained from H. pylori. Line: 1) gastric remains I; 2) gastric remains II; 3) tongue-soft palate; 4) brain; 5) H. pylori ATCC 43504; 6) H. pylori 84–183, and 7) negative control reaction. M = Molecular weight marker (100-bp DNA ladder). B) Hybridization of PCR products with pHp probe.