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For cryopreservation of human zygotes, it is suitable to use only vitrification method. Slow freezing method has more than threefold worse results than vitrification.

The recent reported data for successful pregnancies suggested that the vitrification of human zygotes and early-stage embryos is a perfect alternative to slow freezing techniques especially in countries where cryopreservation of later stage human embryos is prohibited either by law or due to religious reasons.