CFTR and cystic fibrosis: Yet, wild-type CFTR band C from CaCo2, 16HBE14o- and from PBEC ALI migrated slower than wild-type CFTR from HT29 and T84 or the non-CF biopsy, confirming size and/or glycosylation differences between wild-type CFTR of different origins (Ward and Kopito, 1994; Kälin et al., 1999; McClure et al., 2016).