The author and journal apologise for an error in the paper byH J Novaira, D S Ornellas, T M Ortiga-Carvalho, X M Zhang, JSouza-Menezes, S E Guggino, W B Guggino and M M Morales thatappeared in April 2006 issue of Journal of Endocrinology189155165, entitled Atrial natriuretic peptide modulatescystic fibrosis transmembrane conductance regulator chloridechannel expression in rat proximal colon and human intestinalepithelial cells. In the Materials and Methods sectionof the paper, the primers used for the CFTR PCRs in rat colonsamples were 5'-CAG ACT CTG AAC ATG GAG-3' and 5'-GAT GCT GTGATT AAC GTA TG-3', which produced a segment of 615 bp, not 5'-CTGCCA TTG CTG GAG TTG-3' and 5'-GCA GCC ATC CTC TAG AAC-3' asstated incorrectly in the paper.