Which cell surface receptor does HIV bind to on T cells?

1. HIV penetrates the plasma membranes of a subtype of lymphocytes called T-helper cells. 2. It does so by binding to the CD4 receptor, a glycoprotein on the surfaces of T cells. 3. The LDL receptor clears low-density lipoprotein from the blood by receptor-mediated endocytosis, an unrelated pathway. 4. Aquaporins are water channels and clathrin is a coat protein, so neither is a viral binding site. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 5 "Structure and Function of Plasma Membranes", section 5.1 Components and Structure_