Now recall in the first stage of the cell cycle of our animal cell known as interphase the DNA is continually being transcribed into RNA so that we use the RNA to form the proteins that are needed by the cell. And that means our DNA and interface exists predominantly in the chromatin states. However, in mitosis we no longer actually need to transcribe or replicate our DNA. And that means as soon as the cell enters ProPhase of mitosis the DNA condenses from chromatin into chromosomes. So during the process of ProPhase our DNA is being condensed into chromosomes. Now recall that each animal cell contains a single centrosome and the centrosome is the region of the cell that contains two identical Centrios.