Which statement is not true about MHC II?
A) MHC II interacts with the CD4 receptor on T helper cells.
B) MHC II primarily displays extracellular antigens which have been phagocytized.
C) MHC II is present only on antigen-presenting cells.
D) When bound to antigen, MHC II serves a key role in activation of the appropriate T cells.
E) MHC II interacts with both the CD4 and CD8 receptors on T helper and T cytotoxic cells.
Answer: E
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