title: X-gp70: a third molecular species of the envelope protein gp70 of murine leukemia virus, expressed on mouse lymphoid cells.
abstract: Three variants of the gp70 envelope component of MuLV are now recognizable serologically: GIX-gp70, 0-gp70, and X-gp70. The last of these, X-gp70, has so far been found only in mice or cells producing abundant C-type virus. This distinguishes X-gp70, provisionally, from the GIX-gp70 and 0-gp70 variants, each of which can be expressed on normal thymocytes without accompanying virus production, as exemplified by mouse strains 129 and B6, respectively. The X-gp70 genotype, however, is not limited to strains of mice-producing abundant virus, because X-gp70+ leukemias occur in strains of mice which do not produce a great deal of virus and whose thymocytes and other tissues are X-gp70-; this is analogous to the appearance of GIX+ leukemias in GIX- mouse strains.
mesh_terms: D000818:Animals; D000951:Antigens, Neoplasm / Q000032:analysis; D000939:Epitopes; D005796:Genes; D006023:Glycoproteins / Q000276:immunology; D009052:Leukemia Virus, Murine / Q000276:immunology*; D007942:Leukemia, Experimental / Q000276:immunology; D051379:Mice; D008805:Mice, Inbred A / Q000276:immunology; D012190:Retroviridae / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*; D014764:Viral Proteins / Q000276:immunology*
chemical_list: D000951:Antigens, Neoplasm; D000939:Epitopes; D006023:Glycoproteins; D014764:Viral Proteins