Immunostainings of B- and T-cell infiltrates in the stomach.

(A) T cells, seen as dark stainings, are mainly located at the base of the lamina propria, close to the muscularis mucosae whereas (B) the B cells are more evenly distributed throughout the entire thickness of the lamina propria. Both stainings derive from recipients of TβRII^−/− donor bone marrow. × 40 magnification.