Cross-priming of the immune response occurs when _____. (Select all that apply.)
a. viral antigens are presented by MHC class I molecules on the surface of a cell that is not actually infected by that particular virus
b. cytosol-derived peptides enter the endoplasmic reticulum and bind to MHC class II molecules
c. phagolysosome-derived peptides bind to MHC class II molecules
d. peptides of nuclear or cytosolic proteins are presented by MHC class II molecules.
A,D
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