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Partial lysis of human embryos after slow cooling and vitrification. a. Partial lysis of human embryos after slow-rate cryopreservation. Areas highlighted by arrows are lysed blastomeres after thaw. Partiasl lysis was observed in 46.8% of embryos thawed after slow-freezing protocols. b. Thaw of vitrified embryos. Significantly lower levels of partial lysis occurs (17% of thawed embryos in the present data)
