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Mouse stomach colonization levels of wild-type, SHR-tatC, and queA mutant strains. Mice were orally given approximately 1.5 × 108 H. pylori cells of a strain. After 3 weeks, their stomachs were harvested, homogenized, diluted, and plated, and the number of CFU was determined 3 to 5 days after harvest. The number of mice used for each strain is shown above the columns.
