[The defense mechanism and its weakening: the defense mechanism prior to immunity].
D000818:Animals; D003165:Complement System Proteins / Q000502:physiology*; D006801:Humans; D007109:Immunity; D007372:Interferons / Q000502:physiology*; D007694:Killer Cells, Natural / Q000502:physiology; D008264:Macrophages / Q000502:physiology; D009504:Neutrophils / Q000502:physiology; D010587:Phagocytosis
D003165:Complement System Proteins; D007372:Interferons