title: Lack of PAF release in extrinsic asthma.
mesh_terms: D001249:Asthma / Q000378:metabolism*; D001985:Bronchial Provocation Tests; D003094:Collagen / Q000494:pharmacology; D006801:Humans; D010972:Platelet Activating Factor / Q000378:metabolism*
chemical_list: D010972:Platelet Activating Factor; D003094:Collagen