The first signal during helper T-lymphocyte activation involves
A) BCR of the helper T-cell binding with free antigen and engulfing it.
B) CD8 of the helper T-cell binding with MHC class III of the antigen-presenting cell.
C) CD4 of the helper T-cell binding with MHC class I part of the antigen fragment.
D) CD4 of the helper T-cell binding with MHC class II of the antigen-presenting cell.

Question

Quizplus · Accepted Answer

Helper T-cells are activated when their CD4 receptor binds to the MHC class II molecule on an antigen-presenting cell.

The First Signal During Helper T-Lymphocyte Activation Involves