Respuesta :
At the juncture of G1 to G2. Even within a single organism's cells, the length of the cell cycle varies greatly. The amount of time a cell spends in each stage of the cell cycle varies as well.
Cell turnover in humans varies from a few hours during early embryonic development to an average of two to five days for epithelial cells and up to a full human lifetime for specialized cells like cortical neurons or cardiac muscle cells, which spend their entire existence in the G0 state. The cycle lasts roughly 24 hours when fast-diverging mammalian cells are cultured in culture (outside the body under ideal growing circumstances). The G1 phase lasts roughly nine hours, the S phase lasts ten hours, the G2 phase lasts roughly four and a half hours, and the M phase lasts roughly one and a half hours in rapidly dividing human cells with a 24-hour cell cycle. The cell cycle is finished in around eight minutes in fruit fly embryos. Events in the cell cycle are timed according to both internal and exterior to the cell mechanisms.
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