( b ) exposure of either g1- or s-phase cultures to 43 degrees heat caused a depression of bulk dna-synthetic rates resulting in a prolongation of s phase , and ( c ) the intracellular reaccumulation of spermidine and spermine following exposure of g1 cells to a 43 degrees heat shock is temporally related to the recovery of near-normal dna synthetic rates in these cells .
C0080129
s phase
C0007634
cells