Histologic analysis of [H2-Ab1−/− → C3H] mice showed pathologic features similar to human chronic GVHD. The histologic findings of the skin (A-B), liver (C-D), and salivary glands (E-F) from [WT → C3H] mice and [H2-Ab1−/− → C3H] mice are shown. Sclerodermatous skin changes, such as epidermal atrophy, fat loss, follicular dropout, and dermal thickness (B); bile duct loss and fibrosis in the portal area and mild periportal mononuclear infiltrates in the liver (D, arrow); and lymphocyte inflammation, fibrosis, and atrophy of acinar tissue in the salivary glands (F, arrow) were observed in [H2-Ab1−/− → C3H] mice (original magnification, × 100).