词
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).
（接着如果把它）放在
个细胞核已去除的黑面母羊的的营养细胞中，它
就产生个胚芽。
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).
（接着如果把它）放在个细胞核已去除的黑面母羊的的营养细胞中，它就产生个胚芽。
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