CFTR and cystic fibrosis: Iodide efflux on CF cells [94] revealed that monovalent iminosugars 30a and 30c and tri-, tetra and heptavalent iminosugars 31a,b, 32a,b and 33a were able to rescue F508del-CFTR function, with an effect comparable to that of NBDNJ (Figure 9).