ERVW-1 and infection: Moreover, blocking interactions with GLUT1 by either siRNA-mediated down-regulation, or by incubating with GLUT-IgY blocking antibodies, has no effect on the level of infection with HTLV-Env-pseudotyped virus or HTLV Env-mediated fusion or infection in this cell line, suggesting that molecules other than GLUT1 might be involved [56].