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Two percent agarose gel stained with ethidium bromide showing H. pylori PCR products (150 bp) used to identify H. pylori in gastric biopsy samples from patients with normal gastric mucosa (1 to 3), gastritis (4 to 7), and gastric cancer (8 to 11). Water was used as negative control; as positive control, H. pylori DNA from culture was used. The band of approximately 1200 bp is a non-specific band, not associated with H. pylori.
