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Review Question - QID 210588

Antigen Processing and Presentation Antigen Processing QID: 210588 (M1.OMB.18.1)
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QID 210588 (Type "210588" in App Search)
A medical researcher is studying the physiology of the immune system in order to better understand the effects of HIV on patients. He isolates a group of cells that are shown by flow cytometry to be positive for the cell surface marker CD8. He then mixes this cell population with a group of infected cells, crosslinks extracellular interactions, and immunoprecipitates the CD8 protein. He identifies a protein bound to CD8 that is composed of two chains from an adjacent cell. Which of the following best describes the primary function of the protein that was most likely identified?
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