Picture of immature oocytes compared to mature oocytes (IMAGE)

Center for Genomic Regulation

Picture of immature oocytes compared to mature oocytes

Caption

Examples of the human oocyte stages used in this study. On the left is an immature GV-stage oocyte recognizable by a visible cell nucleus (white arrow) called germinal vesicle (GV). On the right is an in vitro matured metaphase II (IVM-MII) oocyte, which is the equivalent of mature eggs in vivo and which can be recognized by the polar body, a by-product of oocyte maturation (black arrow). The majority of changes related to age were observed at this stage of oocytes.

Credit

Montserrat Barragan/Clinica Eugin

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