by contrast , in previous experiments with n-methyl-n'-nitro-n-nitrosoguanidines and polycyclic hydrocarbons in syrian hamster embryo fibroblasts and with ultraviolet light and polycyclic hydrocarbons in c3h/10t 1/2 cells , transformation occurred to an equal or greater extent than mutation measured in the same cells .
C0016030
fibroblasts
C0007634
cells