The nucleoli are typically present during the interphase stage of the cell cycle, particularly in the G1 and G2 phases. However, when it comes to mitosis itself, the nucleoli are not visible in later phases. Specifically, they begin to disassemble during prophase as the chromatin condenses into chromosomes and the cell prepares for division. By the time the cell reaches metaphase and anaphase, the nucleoli are completely absent.
In summary, while nucleoli can be observed in the interphase stages, they dissolve during prophase and do not reappear until the cell completes mitosis. Thus, the nucleoli are not present during the actual phases of mitosis such as prophase, metaphase, anaphase, or telophase.