The central nervous system and the immune system.
D000818:Animals; D000917:Antibody Formation; D001402:B-Lymphocytes / Q000276:immunology; D001921:Brain / Q000502:physiology*; D003214:Conditioning, Classical / Q000502:physiology; D004198:Disease Susceptibility / Q000276:immunology* / Q000523:psychology; D006728:Hormones / Q000097:blood; D006801:Humans; D006968:Hypersensitivity, Delayed / Q000276:immunology; D007031:Hypothalamus / Q000502:physiology; D007111:Immunity, Cellular; D007121:Immunocompetence; D007958:Leukocyte Count; D008016:Life Change Events; D018377:Neurotransmitter Agents / Q000502:physiology*; D012931:Social Environment; D013601:T-Lymphocytes / Q000276:immunology
D006728:Hormones; D018377:Neurotransmitter Agents