Total C3 detected on transfused KEL RBCs in wild-type and FcγR KO mice. Posttransfusion measurements of total C3 on lipophilically labeled KEL RBCs in different strains of recipients, transfused in the absence or presence of anti-KEL immunoprophylaxis. These data, shown at 10 minutes, 1 hour, and 24 hours after transfusion, are representative of 2 independent experiments with 3 mice per group per experiment; error bars indicate SD.