Studies of graft rejection using cells labeled with fluorescent markers demonstrate that:
A. any infiltration of a skin graft depends on MHC mismatch.
B. deep infiltration of a skin graft depends on MHC mismatch.
C. antigen-presenting cells from a skin graft migrate to lymph nodes and present antigen there.
D. host antigen-presenting cells enter the skin graft, then migrate to lymph nodes.
E. Both B and D.
Answer: E