CD4 is a membrane glycoprotein of T lymph ocytes that interacts with major histocompatibility complex class II antigenes and is also a receptor for the human immunodeficiency virus. CD4 is expressed not only in T lymph ocytes, but also in B cells, macrophages, and granulocytes. It is also expressed in specific regions of the brain. The protein functions to initiate or augment the early phase of T-cell activation, and may function as an important mediator of indirect neuronal damage in infectious and immune-mediated diseases of the central nervous system
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L3T4, T4/Leu-3
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55 kD
