when examined by two-dimensional gel electrophoresis , the alveolar cells of human lung show cytokeratin polypeptides typical of simple epithelia ( nos . 7 , 8 , 18 and 19 ) whereas the bronchial epithelium expresses , in addition , basic cytokeratins ( no . 5 , small amounts of no . 6 ) as well as the acidic polypeptides nos .
C0010803
cytokeratin
C1179973
basic cytokeratins