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Effect of oral administration of PAG on CP-suppressed IgA production in the intestine. Fresh feces from mice from each group were collected on days 3, 7, 11, 15, and 19. The feces were freeze-dried, weighed, and dissolved in phosphate-buffered saline containing protease inhibitors. Total IgA levels in fecal extracts were assessed by using an ELISA. * indicates p < 0.05 and ** indicates p < 0.01.
