It is the interval between two mitotic divisions when a cell grows. During this stage, a cell roughly doubles the number of its cytoplasmic components, and replicates its DNA. The three stages of interphase are G1, S, and G2. G1 has to do with the metabolic activities and cell growth. S deals with DNA synthesis which doubles the DNA. G2 has to do with protein synthesis needed for cell division. Cells spend most of their life in interphase.