Internal brush discovered inside lungs, could be key to beating lung disease

Internal 'brush' that lines the lungs could offer insight into treating diseases such as cystic fibrosis and asthma Brush-like layer pushes out sticky mucus and the unwanted matter it contains PUBLISHED: 14:59 GMT, 24 August 2012 | UPDATED: 14:59 GMT, 24 August 2012 The discovery of an internal 'brush' that helps clear lungs of unwanted matter could improve understanding of lung diseases, scientists say.