in 3y1tsf121 , 3y1tsg125 , and 3y1tsh203 , when the density-arrested cells were prestimulated by serum at 39.8 degrees c for various periods of time , the time lag of entry into s phase after release from the density arrest at 33.8 degrees c was initially shortened , and then , prolonged progressively as the period of prestimulation increased .
C0007634
cells
C0080129
s phase