See also BRONCHUS; CELL STRUCTURE AND FUNCTION;
GUT-ASSOCIATED LYMPHOID TISSUE(GALT); LEUKOCYTE;
LYMPHOCYTE; MACROPHAGE; MUCOSA-ASSOCIATED LYM-
PHOID TISSUE(MALT); NOSE-ASSOCIATED LYMPHOID TISSUE
(NALT); PHAGOCYTE; PHAGOCYTOSIS; SKIN-ASSOCIATED
LYMPHOID TISSUE(SALT); VIRUS.252 The Immune System and Allergies