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Photomicrographs of the control case with marked stromal fibrosis at higher magnification. (a) Well-differentiated endocrine neoplasm with prominent stromal fibrosis. Note marked stromal fibrosis extending into pancreatic duct (arrows). (H-E stain.) (b) Serotonin labeling shows strong immunoreactivity. (Original magnification in a and b, ×200.)
