TC Cells Express A(n) ________ Protein Co-Receptor

Question

TC cells express a(n) ________ protein co-receptor.
A) CD4
B) CD8
C) IgM
D) IgG

Accepted Answer

TC cells express CD8 protein co-receptor that binds to MHC class I molecules on APCs. CD4 protein co-receptor is expressed on Th cells, which recognize and bind to MHC class II molecules on APCs. IgM and IgG are not co-receptors, but rather immunoglobulins (antibodies) produced by B cells.