Vitrifying and Warming of Human Oocytes, Embryos, and Blastocysts: Vitrification Procedures as an Alternative to Conventional Cryopreservation
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The important principle of cryopreservation for mammalian embryos is to reduce damage caused by intracellular ice formation. To achieve this goal, two basic approaches were developed: Controlled slow-rate freezing protocols (1 ). and Vitrification protocols (2 ).