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CD40 is expressed in different ovarian tissues. Paraffin wax-embedded ovarian carcinoma tissues were stained by immunohistochemistry using a CD40-antibody. The CD40-positive cells are brown-stained. Staining of four representative tissues is shown: a poorly differentiated ovarian carcinoma tissues, b moderately differentiated ovarian carcinoma tissue, c well-differentiated ovarian carcinoma tissue, and d normal ovarian tissue
