When energy is stored and the cell undergoes differentiation in adverse conditions, the stage is called
G0
Cells which cannot divide further do not proceed beyond the G1 phase and begin to differentiate into specific cell types. Such cells are said to be in the G0 phase. The cells remain metabolically active but do not proliferate. Example: Fibroblast cells help in the healing of wounds, grow and divide again depending on the requirement of the body.