title: ESP-1 helper virus: characterization of type-specific envelope specificities distinct from those of the murine leukemia viruses.
mesh_terms: D000956:Antigens, Viral / Q000032:analysis*; D000939:Epitopes; D006378:Helper Viruses / Q000276:immunology*; D009052:Leukemia Virus, Murine / Q000276:immunology*; D008979:Moloney murine leukemia virus / Q000276:immunology; D009500:Neutralization Tests; D011925:Rauscher Virus / Q000276:immunology; D012190:Retroviridae / Q000276:immunology*
chemical_list: D000956:Antigens, Viral; D000939:Epitopes