Body weights and hemoglobin levels in (a) controls and in homozygous (trf ^hpx) mice transfused with (b) nothing, (c) saline (×2), (d) trf ^hpx erythrocytes (×2), and (e through g) control erythrocytes (1 to 3 doses, respectively). All determinations were performed 3 days after the last transfusion except for the multiple-transfused group (g) which were performed 5 days postinjection. *P < .04; **P < .002; ***P< .007 as compared with untreated trf ^hpx mice (b).