this increase in s-phase cells could be suppressed in the presence of 10-20 mm hydroxyurea ( hu ) , while the same levels of hu did not affect the level of uds at 12 h after treatment , 2,4-dnt produced only a weak response , in contrast to 2,6-dnt which was a potent inducer of uds .
C0080129
s-phase
C0007634
cells