D. CD8 – Explanation
Clusters of differentiation
The table below lists the major clusters of differentiation (CD) molecules
| CD1 | HLA molecule that presents lipid molecules |
| CD2 | Found on thymocytes, T cells, and some natural killer cells that acts as a ligand for CD58 and CD59 and is involved in signal transduction and cell adhesion |
| CD3 | The signalling component of the T cell receptor (TCR) complex |
| CD4 | Co-receptor for HLA class II; also a receptor used by HIV to enter T cells |
| CD8 | Co-receptor for HLA class I; also found on a subset of myeloid dendritic cells |
