CD4-Positive T-Lymphocytes

**Definition:** A critical subpopulation of T-lymphocytes involved in the induction of most immunological functions. The HIV virus has selective tropism for the T4 cell which expresses the CD4 phenotypic marker, a receptor for HIV. In fact, the key element in the profound immunosuppression seen in HIV infection is the depletion of this subset of T-lymphocytes.

**Tree numbers:** - A11.118.637.555.567.569.200 - A15.145.229.637.555.567.569.200 - A15.382.490.555.567.569.200

**Synonyms:** - T4 Cells - T4 Lymphocytes - CD4-Positive Lymphocytes