At the end of this phase, proteins like ATM and ATR check for DNA damage, and the concentration of a complex called maturation-promoting factor increases.
At the end of this phase, proteins like ATM and ATR check for DNA damage, and the concentration of a complex called maturation-promoting factor increases. Progress through this phase is governed by relative concentrations of CDKs and cyclins. During this phase, in which the nuclear membrane remains intact, a cell may enter the quiescent G0 phase at the restriction point. This phase contains two gap phases separated by a synthesis phase, during which DNA is replicated. For 10 points, name this phase of the cell cycle in which a cell spends its time when not performing mitosis. 
At the end of this phase, proteins like ATM and ATR check for DNA damage, and the concentration of a complex called maturation-promoting factor increases.
interphase [accept G1 phase or S phase or G2 phase until "two gap phases" is read] 