"a glycoprotein that is found primarily on the surface of helper T cells; \"CD4 is a receptor for HIV in humans\""@en-us . "0"^^ . . . . . . . . "CD4"@en-us . "cluster of differentiation 4"@en-us . . "14888529-n"^^ . "0"^^ . . "114888529"^^ . "cluster of differentiation 4"^^ . .