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Counts of parietal cells in the oxyntic mucosa of 3–60 day old normal and knockout mice. For each age, three mice were examined, and in each animal, counts from at least 30 longitudinally cut glands were averaged. Data are shown as mean (SEM) cell number per gland. Comparing counts of normal versus knockout mice by the Student’s t test showed significant differences (**p<0.01) at 21–60 days.
