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Immunohistochemical somatostatin receptor 2A (sst2A) positive neuroendocrine lesions of the gut. Membrane bound sst2A staining was seen in hyperplastic enterochromaffin-like (ECL) cell aggregates (arrows, A) and in an ECL cell tumour of the gastric corpus (B), as well as in a gastrinoma (C) of the Papilla vateri and in a carcinoid (D) of the jejunum. Bars 10 μm.
