CFTR delivery to 25% of surface epithelial cells restores normal rates of mucus transport to human cystic fibrosis airway epithelium. oleh Liqun Zhang, Brian Button, Sherif E Gabriel, Susan Burkett, Yu Yan, Mario H Skiadopoulos, Yan Li Dang, Leatrice N Vogel, Tristan McKay, April Mengos, Richard C Boucher, Peter L Collins, Raymond J Pickles