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 
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] 