T cells are stimulated by the binding of antigen-MHC complex to its receptors. To be activated, T cells must also receive a second signal and bind with _______ present on certain antigen-presenting cells.

Question

Quizplus · Accepted Answer

T cells require a second signal to be activated, which is provided by the interaction of the costimulatory molecule B7 on antigen-presenting cells with CD28 on T cells. Therefore, choice C, B7, is the correct answer. The other options are not involved in this process.

T Cells Are Stimulated by the Binding of Antigen-MHC Complex