Fusion process, these approaches are limited in their capacity to define thePLoS Pathogens | www.plospathogens.orgEnvelope Glycoprotein ConstructsThe primary viruses UK7br and UK7br34 were isolated from autopsy brain tissue from an AIDS patient with HIV-1 associated dementia [48]. These envelope glycoproteins were expressed from the pcDNA 3.1 backbone vector. All other envelope glycoproteins descr