Additional research is needed to verify that vitrify 2-to 8-cell stage embryos by OPS method can also develop into later stages .

但 经 OPS方法 冷冻的2～8-细胞期的胚胎 解冻 后能否进一步向后期发育，仍需进行深入的研究。

Results are as follows . Vitrification solution PMDD ( 2 % PVP ) containing many cryoprotectants could vitrify stably and its devitrification rate was also so it is suitable for embryo vitrification .

结果表明：含有多种抗冻剂的玻璃化液PMDD（ 2%PVP），玻璃化稳定，脱玻璃化率较 低，适宜进行玻璃化冷冻。