foreskin-derived low-passage human cell populations were reproducibly transformed with chemical carcinogens when the cells were blocked in g1 , released from the block , and treated with either the carcinogen n-methyl-n-nitro-n-nitrosoguanidine ( mnng ) or with aflatoxin b1 in the s period of the cell cycle .
C0007634
cells
C1517342
blocked