Bleeding mortality associated with cell-mediated thrombocytopenia is weaker than that of antibody-mediated thrombocytopenia. Kaplan-Meier survival plots of irradiated SCID mice transferred with (A) 5 × 10⁴ nondepleted immune splenocytes from CD61 KO mice immunized against BALB/c platelets (n = 15) or 5 × 10⁴ immune splenocytes depleted of either (B) CD4⁺ T cells (n = 15), (C) CD8⁺ T cells (n = 18), or (D) CD19⁺ B cells (n = 14). The data are expressed as the percentage of survival and calculated from the mouse groups in Figure 2.