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Genomic fingerprinting patterns by AP-PCR. Each pair of H. pylori isolates except that for patient 11 showed similar banding patterns. Isolates 2a and b, 6a and b, 7a and b, 9a and b, and 10a and b showed a higher intrastrain variation than did the other pairs, although the major bands corresponded, which contrasts with isolates 11a and b, for which all the bands were different. M, molecular size marker.
