Boy with Cystic Fibrosis Taking a Lung Capacity Test
Original caption: Three of Kathy and Jack McGowan?s five children have cystic fibrosis (CF), the most common deadly genetic disease in the U.S. Its cause is a defect in a gene that controls the balance of salt in lung cells. Mucus builds up, fostering infections that can be lethal. At present, one of every two CF sufferers dies before age 31. John takes a lung capacity test. To develop CF, a child must inherit the defect from each parent.
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