<P> For cells with a longer cell cycle time and a significantly long G phase, there is a second peak of resistance late in G . </P> <P> The pattern of resistance and sensitivity correlates with the level of sulfhydryl compounds in the cell . Sulfhydryls are natural substances that protect cells from radiation damage and tend to be at their highest levels in S and at their lowest near mitosis . </P>

When does a new daughter cell begin its growth in the cell cycle