Cytotoxic T Lymphocytes are Distinguished from Other Lymphocytes by the Presence

Question

Cytotoxic T lymphocytes are distinguished from other lymphocytes by the presence of _________.
A)CD8
B)CD4
C)CD19
D)All of the choices are correct.

Accepted Answer

Cytotoxic T lymphocytes are distinguished from other lymphocytes by the presence of CD8, which is a membrane protein that recognizes and binds to antigens presented by major histocompatibility complex class I (MHC-I) molecules. CD4 is present on helper T cells and CD19 is present on B cells, but neither is specific to cytotoxic T cells.