
The embryo freezing process takes approximately 3 hours. Embryos are sequentially treated with varying concentrations of a special solution, called the cryoprotectant. The cryoprotectant protects the embryos during the freezing process. Each embryo is then drawn into a specially designed sterile straw. The straws containing the embryos are placed into a freezing machine, slowly cooled to -35°C and stored in liquid nitrogen for long-term storage (-196°C).
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