ERVW-1 and infection: However, further comparisons are limited because these studies differed from ours (a) in being focused on cell-free infections, rather than on interactions between barasertib-sensitive HIV-1-infected producer cells and target cells, and (b) in using VSV-G-pseudotyped virions, thus preventing induction or detection of any of the HIV-1 Env-mediated effects crucial to our studies.