Assertion: cystic fibrosis's mucus | /r/CapableOf | build up duct
Facets:
Source sentences:
text: Cystic fibrosis is a genetic disease that causes the body to create thick mucus that builds up and obstructs ducts and tubes within the lungs, digestive tract, and pancreas.
text: This thick mucus can build up and obstruct ducts and tubes within the lungs, digestive tract and pancreas.