Immunohistochemistry-Paraffin: Pepsinogen I Antibody (8003 (99/12)) [NB100-62239] - Differentiation of pyloric-gland type to fundic glands. (A) HE-stained image, showing proliferation of atypical glands associated with mildly enlarged nuclei. (B) Differentiation into fundic glands (pepsinogen-1). Tumor glands are positive for pepsinogen-1. (C) Differentiation into fundic glands (H,K-ATPase). Similar to pepsinogen-1, H,K-ATPase-positive cells can be seen in tumor glands. From: Mitsuishi T, Hamatani S, Hirooka S, Fukasawa N, Aizawa D, Hara Y, et al. (2017)