Leeflang, P.

envelope region si capacity capacity chimeric envelope genes syncytium syncytium formation envelope genes virus syncytia fragment chimeric formation v 2 region +++ sequence immunodeficiency fusion 16.1 v 3 region protein gpl 20 expression virol v 3 regions nsi envelope genes elisa experiment glycoprotein 16.2 transfer antibody sup-ti cells envelope proteins assay variation determinant result gene fragments v 3 loop membrane envelope glycoproteins si capacities product binding domain process study fusion domain envelope regions immunodeficiency virus clone-derived 1992. cd 4 binding 1988. clone gpl 20 elisa membrane fusion process si envelope genes difference restriction tersmette ss fragment function si genes envelope gene syncytium-inducing capacity sup-ti acid variation residue culture charge gp 120 membrane fusion analysis percentage patient identification 16.4 position