Clip: Special | 6m 24s | Video has closed captioning.
Cystic fibrosis one of the most common fatal genetic diseases in the US, where in patients like Kimberly, a thick coat of mucus in the lungs leads to infections that can destroy airways. The source of the disease is a mutated gene, and the latest treatments target the proteins those mutant genes encode.
Problems Playing Video? | Closed Captioning