in comparisons of normal tissues with animal and human tumors , cultured cells before and after transformation with oncogenic agents , tumorigenic and nontumorigenic transformed cells , metastatic and nonmetastatic tumor cells , high- and low-metastatic variants , and tumor cells before and after induction of differentiation to a less malignant phenotype , a consistent finding has been some form of alteration in surface carbohydrate structures .
C0007634
cells
C1516343
induction