What is the role of class II MHC proteins on donor cells in graft rejection?
a. They are the receptors for interleukin-2, which is produced by macrophages when they attack the donor cells.
b. They are recognized by helper T cells, which then activate cytotoxic T cells to kill the donor cells.
c. They induce the production of blocking antibodies that protect the graft.
d. They induce IgE which mediates graft rejection.
b. They are recognized by helper T cells, which then activate cytotoxic T cells to kill the donor cells.
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