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CHGA expression by immunohistochemistry in representative tissue samples. a Normal islet cells (magnified ×20), b microcystic serous cystadenoma (magnified ×20), c well-differentiated neuroendocrine tumor, benign characteristics (magnified ×20), d well-differentiated neuroendocrine tumor, undetermined characteristics (magnified ×20), e neuroendocrine carcinoma (magnified ×20); bottom right CHGA expression level by diagnosis
