ABSTRACT - Jane E Brody column on efforts to fight cystic fibrosis, disease that afflicts about 30,000 Americans; notes cystic fibrosis, result of defective protein, is chronic, progressive and ultimately fatal disease that clogs lungs and pancrease with thick, sticky mucus; drawing (M) More than 10 million people in this country carry in all their cells one copy of a defective gene that regulates the movement of sodium, chloride and water in and out of cells.

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