Fig. 1

a–c Normal villi with T lymphocytes in the normal range (< 25 for 100 epithelial cells). a–b Hematoxylin and eosin staining × 10; c CD3 immunostaining × 10 original magnification. d–f: Eosinophils in the lamina propria (arrows). Hematoxylin and eosin staining × 100 original magnification. g–i Linear distribution of T lymphocytes in the deeper part of the mucosa over the muscularis mucosae, the outermost layer of the mucosa (arrows). CD3 immunostaining g × 10 original magnification h–i × 40 original magnification. j–l Cluster of 5–6 T lymphocytes in the superficial epithelium of villi (yellow rectangles) CD3 immunostaining × 100 original magnification