title: Tumor-associated immunosuppressive factors.
mesh_terms: D000818:Animals; D000917:Antibody Formation; D002474:Cell-Free System; D002478:Cells, Cultured / Q000382:microbiology; D005622:Friend murine leukemia virus / Q000276:immunology*; D007165:Immunosuppression Therapy; D012515:Mast-Cell Sarcoma / Q000276:immunology; D051379:Mice; D008815:Mice, Inbred Strains; D008970:Molecular Weight; D009368:Neoplasm Transplantation; D009374:Neoplasms, Experimental / Q000276:immunology*; D010954:Plasmacytoma / Q000276:immunology; D012995:Solubility; D013154:Spleen / Q000276:immunology / Q000382:microbiology; D014412:Tumor Virus Infections / Q000276:immunology*