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T h e presence of HL-A antigens on various blood cells was determined by absorption techniques with the absorbed antisera being tested in the lymphocyte cytotoxicity test for loss of antibody activity.T o overcome the risk of contamination by lymphocytes, methods for the preparation of pure cell suspensions of platelets, granulocytes and erythrocytes were evolved, giving high yields of cells.The following antigens were detected on platelets and granulocytes, but not on erythrocytes either fresh or papainized:

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