title: The cellular basis of immunity.
mesh_terms: D000818:Animals; D000917:Antibody Formation; D006706:Homeostasis; D006801:Humans; D007108:Immune Tolerance; D007109:Immunity; D008214:Lymphocytes / Q000276:immunology; D008221:Lymphoid Tissue / Q000276:immunology*; D008264:Macrophages