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Immunohistochemical blood typing in needle biopsy specimens of the prostate. Specimens from two patients were mixed up in one tissue container. The blood group was type A in one patient and type O in the other. Immunostaining for type A substance is positive in endothelial cells in panel (a) but negative in panel (b). It is evident that the specimen of the patient with type A blood group contains well-differentiated adenocarcinoma (star).
