In defence of the lung.
D000917:Antibody Formation; D001692:Biological Transport; D002923:Cilia / Q000502:physiology; D006801:Humans; D007111:Immunity, Cellular; D007071:Immunoglobulin A, Secretory / Q000096:biosynthesis; D008168:Lung / Q000276:immunology* / Q000502:physiology; D008264:Macrophages / Q000276:immunology; D009093:Mucus / Q000502:physiology
D007071:Immunoglobulin A, Secretory