The evaluation and selection of embryos for fresh uterine transfer orcryopreservation is largely based on their morphology. Ideally, selection of normal viable embryos with high implantation potentialwould be based on chromosomal integrity with expression of the appropriate developmental genes and normal metabolic function. Themetabolic alterations of developing preimplantation embryos remains poorly understood (1–4). At present, specific early embryonicmolecular markers indicative of optimal development are yet to beidentified (5, 6). We identified reactive oxygen species (ROS) andtotal antioxidant capacity in day 1 culture media as possible metabolic markers of in vitro embryonic development (4, 7). Bothmarkers, at certain levels, were significantly correlated with in vitroembryonic development parameters, as well as clinical pregnancy.Oxygen species has also been shown to be involved in the etiology of defective embryo development and embryonic fragmentation. The ROS generation may be from embryo metabolism orembryo surroundings (8, 9)
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