ERVW-1 and infection: The cell viabilities (% control) of each group of rVSV-infected STLV-1 Env-expressing cells relative to the corresponding virus-inoculated control cell groups are shown in Figure 4B. The cell viabilities of VSVΔG-JmGL-AcGFP-infected cells at 3 and 5 days after infection were 44.1 ± 5.0 and 31.3 ± 6.5, respectively, and the number of STLV-1 Env-expressing cells was dramatically reduced.