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Electrophoresis of DNA amplified by PCR using Helicobacter genus-specific primers Hcom 1 and Hcom 2 (A) and Hcom 1 and Hcom 3 (B) for pig stomach samples with different ulcer lesion grades. Lane M, pGEM DNA markers; lane 1, grade 0; lanes 2 and 3, grade 1; lanes 4 and 5, grade 2; lanes 6 and 7, grade 3.
