the failure to detect the 'srs-a ' leukotrienes in sputum from bronchial asthma may be attributable to either losses during extraction , the insensitivity of the assay procedure or to more rapid catabolism of ltc4 and ltd4 by bronchial secretions in asthma than in cystic fibrosis .
C0038056
sputum
C1511332
bronchial secretions