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While a complete failure of meiotic maturation following hCG administration is rare during IVF cycles, cases arise in which patients repeatedly display a high incidence of failure to complete maturation to metaphase II (MII) in vivo. For the immature oocytes of such patients, our objectives were (i) to ask whether progression to MII could be supported in vitro, and (ii) to define their microtubule/chromatin properties following in-vitro maturation (IVM). Together, these studies were aimed at augmenting our understanding of factors underlying meiotic arrest in the human.

Distinct microtubule and chromatin characteristics of human oocytes after failed in-vivo and in-vitro meiotic maturation