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Figure 3-10. A scheme illustrating the phases of mitosis (After Alberts et al.,1989).
Prophase. Prophase is a transition between G₂ and M phases. The
chromatin, which during interphase is diffusionally distributed, gradually
condensates in shapely chromosomal threads. During phase S each
chromosome has replicated and consists of two daughter chromatids
connected with centromeres in between.