The cell type shown below is found between follicles in lymph nodes and expresses B7-1, B7-2, and class II MHC. What type of cell is this?
A. B cell
B. Follicular dendritic cell
C. Thymic epithelial cell
D. Dendritic cell
E. Plasma cell
ANS: D. Dendritic cells have delicate cytoplasmic extensions, which may serve to enhance interactions with T cells. They express molecules required for naive T cell activation, and they migrate from infected tissues into the parafollicular (T cell) areas of lymph nodes.
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