Immunohistochemical microphotographs of esophageal mucosal tissue in pill-induced esophagitis.

<p>(A) CD3. T lymphocytes are lodged between squamous epithelial cells. (B) CD117. Intraepithelial mast cells are rarely found. (C) & (D) pSTAT3. Diffuse nuclear staining is exhibited in this case (C), but was negative in another case (D). (E) leptin receptor. This picture shows a negative pattern with normally stained basal cells. (F) phospho-mTOR. Membranous staining is noted in only two cells (at the right middle portion, and the left lower end). Magnifications: A, B, E, F, x400 and C, D x200 (immunohistochemical stain).