It had become an issue since the cloning of Dolly the sheep in Scotland.

自苏格兰的多利羊被克隆后，这已成为一个争议性问题。

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Conservationists have used cloning to help protect endangered species such as the mouflon sheep.

环境保护主义者已经使用克隆来帮助保护濒危物种，例如穆福隆羊。

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In 1997, Dolly the Sheep was the first animal to be created through cloning.

1997年，绵羊多莉成为世界上首个通过克隆技术培育出来的动物。

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In 1997, when Dolly the sheep became the first mammal to be cloned from an adult sheep, cloning a human entered the realm of possibility.

CNN: 'Raelian' biochemist insists she will clone human

His role in cloning Dolly the sheep, the world's first clone from an adult cell, led to an OBE in 1999 and he has been elected to five scientific academies worldwide.

BBC: Dolly creator heads Scots honours

His role at the Roslin Institute in cloning Dolly the sheep, the world's first clone from an adult cell, led to an OBE in 1999 and he has been elected a fellow of five scientific academies worldwide.

BBC: Dolly the sheep creator knighted