the study reported here shows that when ml-1 cells , induced to differentiate with df contained in mitogen-stimulated human leukocyte-conditioned medium ( cm ) are treated with the carcinogen n-nitroso-n-methylurea , their differentiation program is interrupted and proliferation is resumed at a stably increased rate of growth ( doubling time , 25.1 versus 31.3 h ) .
C0007634
cells
C0007589
differentiation