M. dunni cells were also treated with the same set of glycosylation inhibitors prior to virus infection ( Table 4 ). All inhibitors reduced the resistance of M. dunni cells to infection with MoMLV, but no comparable increase in titer was noted with Spl574. To confirm that this effect is on entry, DMM-treated M. dunni cells were infected with LacZ pseudotypes of MoMLV; pseudotype titer was 10 3.6 on DMMtreated cells compared to no detectable LacZ expressing cells in untreated M. dunni.