Immunoblot showing N-linked glycosylation of renal electrogenic Na+-HCO Embedded Image cotransporter (NBCe1) from rabbit, rat, bovine, and salamander. The crude membranes extracted from kidneys were incubated in the absence (−) or presence (+) of peptide N-glycosidase F (PNGase F). Membrane proteins were separated on a 7.5% SDS-polyacrylamide gel, transferred to a PVDF membrane, and probed with an antibody to the COOH terminus of rat NBCe1.