FIG. 4.

Surface expression of viral envelope proteins on microglia isolated ex vivo. Microglia and peritoneal macrophages isolated from rats and 3T3 cells were stained with monoclonal antibody 48 (thick line), specific for MuLV-NT40 envelope proteins, or with an irrelevant antibody of the same type (thin line). Surface expression of viral envelope proteins was detected in peritoneal macrophages isolated from NT40-infected rats and in 3T3 cells infected with NT40 but not in microglia isolated from infected rats.