Various whole cell extracts (30 μg) were separated by 10% SDS-PAGE, and the membrane was blotted with Cytokeratin 20 antibody [N2C2], Internal (GTX639555) diluted at 1:1000. The HRP-conjugated anti-rabbit IgG antibody (GTX213110-01) was used to detect the primary antibody. Corresponding RNA expression data for the same cell lines are based on Human Protein Atlas program.