T cells may be important for recognition of common antigens at epithelial boundaries between the host and the external environment. The
T cells differ from the αβ T cells in which one of the following ways?
A) T cells recognize only nonprotein antigens.
B) T cells are not MHC-restricted and do not recognize MHC-associated antigens.
C) The TCR complex contains CD3ƴ or CD3Ϭ but not CD3Ϭ.
D) Most mature T cells express either CD4 or CD8 but not both.
E) T cells lack key biologic activities, including the ability to lyse target cells.
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