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Figure 1


Fig. 1. The process of oocyte maturation. The maturation process is driven by multiple factors, including Cdc2–cyclin-B, Mos protein and Emi2 protein, the relative levels of which throughout the maturation process are illustrated. Xenopus oocytes are arrested in G2. Upon progesterone treatment, oocytes enter meiosis I (MI). Oocytes then transit directly from meiosis I to meiosis II (MII), without an intervening interphase, and arrest at MII (when they are termed eggs), often for prolonged periods of time. Only upon fertilization will the eggs exit MII and commence rapid embryonic cell divisions.





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