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The region of the H. pylori ureB gene PCR was amplified and sequenced. The PCR-amplified region corresponding to nucleotides 96 to 1029 of strain 85P is indicated as a hatched bar. The sequenced region corresponding to nucleotides 226 to 886 is indicated as a black bar. White arrowheads show the recognition sites for Sau3A. Closed circles indicate the nucleotide mutation site found by Sau3A. The B and C PCR-RFLP types were considered to be variants.
