the lines explored were undifferentiated embryonal carcinoma pcc4 cells which normally do not express endo a gene , pcc4 cells cultivated permanently at 31 degrees c ( pcc4-31 ) , which are epithelial-like cells derived by differentiation from pcc4 cells , but which do express endo a gene , tdm1 cells , an epithelial teratocarcinoma cell line , and 3t6 mouse fibroblasts .
C0007589
differentiation
C0007634
cells