title: Helper viruses associated with avian acute leukemia viruses inhibit the cellular immune response.
mesh_terms: D001355:Alpharetrovirus / Q000502:physiology; D000818:Animals; D001353:Avian Leukosis / Q000276:immunology*; D001354:Avian Leukosis Virus / Q000502:physiology*; D009189:Avian Myeloblastosis Virus / Q000502:physiology; D002645:Chickens; D006378:Helper Viruses / Q000502:physiology*; D007108:Immune Tolerance; D008213:Lymphocyte Activation; D010835:Phytohemagglutinins / Q000494:pharmacology; D001356:Reticuloendotheliosis virus / Q000502:physiology; D012526:Satellite Viruses / Q000502:physiology; D050378:T-Lymphocytes, Regulatory
chemical_list: D010835:Phytohemagglutinins