The Second Signal Required for T_C Activation Is

question 19

Multiple Choice

The second signal required for T_C 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 T_H1 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 T_H0 cell.

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