21. The Immune System
Activation of T Lymphocytes
Multiple Choice
Multiple ChoiceBefore T cells become activated, they require an antigen encounter. Naive T cells are shown to express L-selectin which aids in binding to high endothelial cells expressing L-selectin ligand in regions where they are most likely to encounter an antigen. In which of the following locations are these high endothelial cells most likely to be located?
A
Bone marrow.
B
Capillaries.
C
Lymph nodes.
D
Heart.
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