G0 phase
The G0 phase is a stage of the cell cycle. Cells enter the G0 phase when the extracellular conditions are not optimal forcing the cell into a resting state where it does not divide[1]. Cells can remain in this state for an indefinite amount of time until conditions improve and stimulate growth via a signal sent that instructs the cell to re-enter the cell cycle[2]. This is very common for differentiated cells[3].