Which of the following statements is TRUE of exogenous antigens?
A. All cells except red blood cells process exogenous antigens.
B. Exogenous antigens are presented on class I MHC proteins.
C. Only B cells can recognize exogenous antigens.
D. Exogenous antigens are produced by cells infected with intracellular pathogens.
E. Dendritic cells and macrophages process exogenous antigens.
Answer: E
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