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Intraepithelial lymphocytes and Marsh classification. A: Schema of the intraepithelial distribution of the intraepithelial lymphocytes (top, side and bottom, see text); B: Marsh 0, normal villous architecture with en-face cut (HE, × 100); C: Marsh I (HE, × 100); D: Marsh IIIA (HE, × 100); E: Marsh IIIB (HE, × 100); F: Marsh IIIC (HE, × 100). Marsh-Oberhuber classification is often shortened as Marsh.
