Figure 6.
Recipients of H2-DMα−/− grafts are efficient producers of alloantibodies. The presence and level of serum alloantibodies was determined by FACS®. (A) All three recipient groups produce nearly equal levels of alloantibodies directed against allogeneic class I 7 d after transplant. (B) Serum collected at the time of rejection from recipients of I-Aβ b−/− or H2-DMα−/− grafts, ∼20 d, have an elevated level of class I–specific alloantibodies. (C) Recipient sera did not stain B cells from mice lacking MHC expression (β2m−/− × I-Aβ b−/−). In B and C, data are means ± SD of serum samples from at least three animals.