Multiple Choice
Following an acute virus infection in which the host clears the virus by approximately one week post-infection, a population of virus-specific memory CD8 T cells is maintained and can be detected for months to years post-infection. In mice with a knockout of a single cytokine, virus-specific memory CD8 T cells cannot be maintained, and disappear over time as shown in Figure. 
The most likely identity of the cytokine that is missing in these knockout mice is:
A) IL-15
B) IL-2
C) IL-21
D) IL-23
E) IL-4
Correct Answer:
Verified
Correct Answer:
Verified
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