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Comparison of number of two-cell embryos, blastocysts and expanded blastocyst among cryopreservation methods. % 2c: percentage of two-cell embryos; % 2c/blast: percentage of blastocysts from two-cell embryos; % 2c/HgB: percentage of expanded blastocyst from two-cell embryos. RV: raffinose vitrification; RS-C: raffinose slow-cooling; FC: fresh control. *Significant differences; P < 0.05.
