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Latex beads coated with secretory immunoglobulin (IgA) instilled into mouse intestinal loops are taken up by M cells present in Peyer's patch follicle‐associated epithelial tissue. Bead adsorption and uptake is greater at the edge compared with the apex of follicle domes. Coating beads with bovine serum albumin (BSA) causes a fourfold reduction in adsorption and a twentyfold reduction in uptake. Results demonstrate selectivity between adsorption and uptake and between the ability of different proteins to facilitate uptake.

Jejunal intraepithelial lymphocyte numbers fall and lactase activity increases during early infection with the intestinal parasite Nematospiroides dubius. Both these variables later return to values found in control mice. These results support the view that local immune reactions, suppressed by the presence of N. dubius, normally inhibit lactase expression by mouse enterocytes.