The purpose of this study is to investigate the development of human embryos in vitro under two different oxygen concentrations; a static 5% during all five days of culture or under an oxygen gradient, starting with 8% from day-0 to day-3, continuing with 5% on day-3 and following with 2% of oxygen from the end of day-3 to day-5.
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Proportion of Inseminated Oocytes Developed to the Morphologically Optimal Blastocysts on Day 5
Timeframe: Embryos will be annotated on day 5 post insemination (at 8:00 am).