CFTR and cystic fibrosis: The cystic fibrosis transmembrane conductance regulator (CFTR) is a chloride channel found on epithelial cell membranes [1–10], and its dysfunction is associated with cystic fibrosis (CF) that involves dysregulation of epithelial fluid transport in the lungs, pancreas, and other organs of the body [7, 8, 11, 12].