Figure 1. CFTR model.
CFTR structural elements are shown in scale according to a homology model (Serohijos et al. 2008). TMs, CLs and NBDs specify the areas occupied by transmembrane domains, cytoplasmic loops and nucleotide binding domains, respectively. The positions of the structural elements used for the REFER analysis are shown as a black spheres and labelled by the number of the amino acid in the sequence.