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Cystic fibrosis Hannah Taylor Cystic fibrosis (CF) is the number-one life-shortening inherited disease of young people. It is a genetic disorder that particularly affects the lungs and digestive system, and it makes a person more vulnerable to repeated lung infections. Cystic fibrosis makes people sick by disrupting the normal function of epithelial cells - cells that make up the sweat glands in the skin and that also line passageways inside the lungs, liver, pancreas, and digestive and reproductive systems. In CF, the inherited CF gene directs the body's epithelial cells to produce a defective form of a protein called CFTR. When the CFTR protein is defective, epithelial cells can't regulate the way chloride passes across cell membranes. This disrupts the essential balance of salt and water that is needed to maintain a normal thin coating of fluid and mucus inside the lungs, pancreas, and passageways in other organs. The mucus becomes thick, sticky,...

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