;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）放在一个细胞核已去除的黑面母羊的的营养细胞中，它一会儿就会产生一个胚芽。
，未受
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）放在一个细胞核已去除的黑面母羊的的营养细胞中，它一会儿就会产生一个胚芽。
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