Abstract
Immature oocytes from superovulated cycles can undergo the final stages of meiotic maturation spontaneously in vitro, especially, from metaphase I (MI) stage. In order to reach the optimal fertilization time window for ICSI, oocyte vitrification in combination with in-vitro culture might offer a solution to provide additional usable eggs. Therefore, the objective was to evaluate the efficiency of MI-II vs. MII sibling oocytes after oocyte vitrification.
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