CFTR and cystic fibrosis: In contrast, the majority of CFTR from wild type intestinal duodenal epithelia were higher molecular weight proteins migrating around 170 kDa reflecting the different glycosylated stages of the proteins corresponding to bands B to C, with a significant portion remaining in band A. The protein band pattern of wild type compared to CF intestinal epithelial cells indicated that the anti-CFTR antibodies have recognized CFTR specifically.