When two cytoplasts and one granulosa cell were fused by PEG, the fusionrate in 50% of PEG was significantly different with that of 45%, 55% and60% (39.

• 采用聚乙二醇(PEG)对两个半卵胞质体与供体细胞进行融合，50%25的PEG的融合率与45%25、55%25和60%25PEG的融合率差异显著(39。