ITIH4 and infection: Meanwhile, host cells could not obtain any GFP signal from VSV-G-pseudotyped HIV-1 Gag-iGFP because VSV-G-pseudotyped HIV-1 Gag-iGFP did not have gp120/gp41 to interact with host cells and the trans-infection of HIV was blocked with the presence of endocytosis inhibitor cocktails in the conditioned culture medium.