MDTF-fePit1 cells were permissible for infection with all FeLV-B Env-pseudotyped viruses (GA, MZ40-5B, KG20-5B, FO36-5B, and ON-T), whereas only two FeLV-B Env-pseudotyped viruses (FO36-5B and ON-T) could infect MDTF-fePit2 cells (Fig. 2E). Here, ERVW-1 is linked to infection.