Quality of Human Embryos in IVF, Culturing in Differentiated Oxygen

By culturing the embryos in a differential O2 set-up, changing the O2 tension from reduced (5% O2) to ultralow (2% O2) from day 3 to day 5 of embryo development in vitro, we mimic the physiological differential changes in O2 as the embryo migrate from the oviduct to the uterus and develops in vivo.