KRT20 and neoplasm: For a morphologic comparison between HCCR-1-derived tumor cells and epithelial cells, we determined whether HCCR-1-derived tumor cells expressed epithelial cell markers, such as the epithelial membrane antigens (Figure 1L), cytokeratin 7 (Figure 1M), cytokeratin 8 (Figure 1N), cytokeratin 19 (Figure 1O), cytokeratin 20 (Figure 1P), and the mesenchymal marker vimentin (Figure 1Q).