While this is occurring an unfertilized egg cell is taken from a Blackface ewe with its DNA filled nucleus taken out leaving a nucleus free egg cell that will later produce an embryo (3).
（接着如果
）
在一个细胞核已去除
黑面母羊营养细胞中，一会儿就会产生一个胚芽。
卵，未受精卵While this is occurring an unfertilized egg cell is taken from a Blackface ewe with its DNA filled nucleus taken out leaving a nucleus free egg cell that will later produce an embryo (3).
（接着如果）在一个细胞核已去除黑面母羊营养细胞中，一会儿就会产生一个胚芽。
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