1864382 Env-CT Employing antibodies against the cytoplasmic tail of the HIV-1 glycoprotein 1 1864381 Env-CT Env cytoplasmic tail 1 1864380 Env-CT Env onto assembling virions is governed by its cytoplasmic tail 1 1864383 Env-CT Env protein lacking its long cytoplasmic C-terminal domain 1