Fibre systems in sputum.
D001991:Bronchitis / Q000378:metabolism / Q000473:pathology; D004247:DNA / Q000378:metabolism; D006023:Glycoproteins / Q000032:analysis*; D006801:Humans; D013183:Sputum / Q000032:analysis* / Q000648:ultrastructure; D013194:Staining and Labeling
D006023:Glycoproteins; D004247:DNA