title: Are endogenous C-type viruses involved in the immune system?
mesh_terms: D000914:Antibodies, Viral; D000917:Antibody Formation; D000937:Antigen-Antibody Reactions; D002478:Cells, Cultured; D005814:Genes, Viral; D007165:Immunosuppression Therapy; D012190:Retroviridae / Q000235:genetics / Q000276:immunology*; D013154:Spleen / Q000276:immunology*
chemical_list: D000914:Antibodies, Viral