The second signal required for TC activation is
A) binding of a CD28 molecule on the T cell to a B7 protein on an antigen-presenting cell.
B) secretion of the cytokine IL-2 from a TH1 cell.
C) binding of a CD8 molecule on the T cell to an antigen-MHC I complex on an antigen-presenting cell.
D) secretion of the cytokine IL-1 from a TH0 cell.
Correct Answer:
Verified
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