Figure 19.19: Cystic fibrosis was the first genetic disease for which the causative gene was isolated entirely by positional cloning. New treatments have greatly helped patients with cystic fibrosis. This girl wears a “smart vest,” which shakes her chest to help break up mucous in her lungs, and inhales from a nebulizer that contains enzymes and salt water, which also help break up mucous.
[Jeffrey Sauger Photography.]