ERVW-1 and infection: To determine whether infection of MCM required a functional pentameric complex for RhCMV to overcome species restriction we inoculated four MCM with 68–1 RhCMV/env (1 x 107 PFU) and two of these MCM were co-inoculated with either 68–1.2 RhCMVΔUL128/gag (2.5 x 106 PFU) or 68–1.2 RhCMVΔUL130gag (2.5 x 106 PFU).