T helper cells possess a glycoprotein called CD4. This molecule binds to ________.

A) MHC class I molecules
B) MHC class II molecules
C) MHC-CD8 antigens
D) MHC-CD28 antigens
E) Interleukin-1 receptor

CD4

A glycoprotein found on the surface of immune cells such as T helper cells, monocytes, macrophages, and dendritic cells, playing a key role in the immune system’s response to pathogens.

MHC Class II

Proteins found on the surface of certain immune cells that present antigens to the immune system, critical in distinguishing between self and non-self.

MHC Class I

Molecules found on the surface of all nucleated cells that present peptide fragments to immune cells, playing a critical role in the immune response to infections.