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Chromium survival studies were performed with AnWj-positive allogeneic blood in a patient with autoanti-AnWj. 99mTc-labeled autologous RBCs that had depressed AnWj expression had normal survival (77% [94.7% 51Cr equivalent]) at 24 hours, whereas 51Cr-labeled allogeneic AnWj-positive cells had 76 percent survival at 24 hours and 55 percent survival at 7 days. These studies suggest that the specificity of the autoantibody may have implications for transfusion therapy when the development of such autoantibodies is associated with decreased antigen expression on the patient's cells.