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(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.
