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Full‐grown mouse antral oocytes are classified as surrounding nucleolus (SN) or not‐surrounding nucleolus (NSN), depending on the respective presence or absence of a ring of Hoechst‐positive chromatin surrounding the nucleolus. In culture, both types of oocytes resume meiosis and reach the metaphase II (MII) stage, but following insemination, NSN oocytes arrest at the two‐cell stage whereas SN oocytes...