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:
Definitions:
Target Market
A specific group of consumers identified as the intended recipients of a product, service, or marketing campaign.
In-store Presentation
The method of displaying products in a retail space to attract customers and encourage sales.
Climbing Wall
A physical structure designed for climbing sports, featuring hand and foot holds of various sizes and shapes.
Stocked Aquarium
An aquarium that has been populated with a variety of aquatic plants, fish, or other marine life, typically for the purpose of decoration, hobby, or research.
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