NCIt definition : Claudin-18 (261 aa, 28 kDa) is encoded by the human CLDN18 gene. This protein plays
a role in tight junction formation in the epithelium of the lung.;
NCIt note : Claudin-18 is predominantly expressed in normal lung epithelium. (Clin Cancer Res
2008;14:7624-7634); Uniprot considers isoform A1 the canonical form of the claudin-18 protein. The transcript
for this isoform utilizes the start codon in exon 1a (1.1).;