CD4 and CD8 are ________.
A) proteins secreted by antigen-presenting cells
B) receptors present on the surface of natural killer cells
C) T-independent antigens
D) molecules present on the surface of T cells where they interact with major histocompatibility (MHC) molecules
E) molecules on the surface of antigen-presenting cells where they enhance B-cell activity

Question

Quizplus · Accepted Answer

CD4 and CD8 molecules are present on the surface of T cells and help them interact with major histocompatibility (MHC) molecules on antigen-presenting cells. CD4 is mainly present on helper T cells, while CD8 is present on cytotoxic T cells.

CD4 and CD8 Are ________