P. yoelii NL infection of TfrcMRI24910/+ mice. Overall parasitemias (A), mature erythrocyte parasitemias (B), reticulocyte parasitemias (C), reticulocyte counts (D), and erythrocyte counts (E) were determined by flow cytometry. Mice were infected with 1 × 105 parasitized erythrocytes. Error bars indicate SEM. **, P < 0.01 between wild-type and mutant mice. All data are from one experiment with 5 to 7 female mice per group.