5. Herpes simplex virus favors neurons for latency because of the low level of , which reduces the likelihood of killing by CD8 T cells. A. LFA-1 B. Toll like receptors (TLRs) C. Invariant chain D. MHC class I E. MHC class II 6. If a nave T cell fails to be activated by corresponding peptides displayed by MHC on dendritic cells, it will leave this peripheral lymphoid tissue and enter another lymph node through blood circulation due to A. Lower concentration of sphingosine 1-phosphate (S1P) in the blood than in lymphoid tissue and retained L-selectin expression on nave T. B. Higher concentration of sphingosine 1-phosphate (S1P) in the blood than in lymphoid tissue and retained L-selectin expression on nave T. C. Lower concentration of sphingosine 1-phosphate (S1P) in the blood than in lymphoid tissue and downregulated L-selectin expression on nave T. D. Higher concentration of sphingosine 1-phosphate (S1P) in the blood than in lymphoid tissue and downregulated L-selectin expression on nave T. 7. During a typical infection, dendritic cells first encounter pathogen in and then transport the pathogen to where pathogen-derived peptide fragments are presented to A. secondary lymphoid tissue, infected peripheral tissue; T cells B. secondary lymphoid tissue, infected peripheral tissue; B cells C. Endocytic vesicles; cell surface; MHC molecules D. Infected peripheral tissue; secondary lymphoid tissue; T cells E. Infected peripheral tissue; secondary lymphoid tissue; B cells.