protein 蛋白质 CD4 molecule CD4 分子 A protein that is a translation product of the human CD4 gene or a 1:1 ortholog thereof. CD4 is an accessory protein for MHC class-II antigen/T-cell receptor interaction. It is the primary receptor for HIV-1. CD4 has four immunoglobulin-like domains in its extracellular region that share the same structure, but can differ in sequence. CD4 T-cell differentiation antigen L3T4 T-cell surface antigen T4/Leu-3 T-cell surface glycoprotein CD4 T细胞分化抗原L3T4 T细胞表面抗原T4/Leu-3 T细胞表面糖蛋白CD4 是人CD4基因或其1:1直系同源物的翻译产物的蛋白质。 CD4是MHC II类抗原/T细胞受体相互作用的辅助蛋白。它是HIV-1的主要受体。 CD4在其胞外区具有四个免疫球蛋白样结构域，结构相同，但在序列上有所不同。