A glycoprotein predominantly found on the surface of helper T cells. In humans, it is a receptor for HIV, enabling the virus to gain entry into its host.
- cluster of differentiation 4
Designating or of a biochemical receptor found on the surface of various cells, esp. helper T cells: HIV binds to this receptor.
Webster's New World
(immunology) A glycoprotein found on the surface of helper T cells; in humans, it enables the HIV virus to enter a cell.