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The first mitotic division of parthenogenetic zygotes. “*” and black line represent that the cleavage rate of the control and vitrification + MT groups are significantly different compared to vitrification group at 16–19 hpa under the black line (P < 0.05). Dotted lines represent the time when 10% or 50% of zygotes cleaved in each group, respectively. The data are expressed as mean ± standard error of three independent trials. “n” represents the cell number used in this experiment
