CFTR cystic fibrosis transmembrane conductance regulator CFTR CFTR CFTR CFTR CTFR CFTR CTFR CTFR cystic fibrosis transmembrane conductance regulator cystic fibrosis transmembrane conductance regulator CFTR CFTR cystic fibrosis transmembrane conductance regulator CFTR CFTR CFTR Wikipedia CFTR