An important way in which effector T cells differ from naive T cells is that _____
a. the cell-surface level of LFA-1 is lower on effector T cells
b. L-selectin is upregulated during differentiation of effector T cells
c. cellular proliferation occurs after effector T cells leave the secondary lymphoid tissues
d. the provision of co-stimulatory signals is not required to induce a response by effector T cells
e. effector T cells do not recirculate between lymph, blood, and secondary lymphoid tissues.
D
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