Scientists say the discovery of an internal "brush" that helps clear lungs of unwanted matter could help them understand more about lung diseases.
A team from the University of North Carolina found that the brush-like layer pushes out sticky mucus and the foreign bodies it contains.
Writing in Science, it says that could help identify what goes wrong in cystic fibrosis, asthma and similar diseases.
UK lung experts said the work aided understanding of how lungs function.
The mucus, which helps collect inhaled pollutants, emerges as a runny nose and a wet cough.
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