this capacity of tumor cells to specific ultrastructural differentiation and formation of tumors consisting of nondifferentiated cells alone or of nondifferentiated and differentiated cells of one or several types , as well as the discovery of differentiated cells simultaneously with signs of cells of two types ( chimera cells ) suggest that either polypotent ( stem cells ) or monopotent ( precursor cells ) cells undergo malignancy .
C0007589
the
C0007634
cells