Unlike intact IgGs, single-cleaved IgGs that target in vivo cells do not cause cell clearance. (A) Percentage of remaining murine CD4+ splenocytes detected in vivo by flow cytometry at 4 days following treatment with no antibody (control), intact GK1.5, and single-cleaved GK1.5 (scIgG). Bar heights correspond to the mean ± SD of five animals. (B) Blood platelet counts in dogs before and 24 h after treatment with no antibody (control), intact mAb3, and single-cleaved mAb3. Bar heights correspond to the mean ± SD of five animals.