Reproductive cloning, such as the process that was used to create Dolly the sheep, also uses the nuclear transfer technique. However, instead of removing the inner cell mass to derive a stem cell line, the blastocyst is implanted into the uterus and allowed to develop fully. In 2002, the National Academies issued the report Scientific and Medical Aspects of Human Reproductive Cloning, which concluded "Human reproductive cloning should not now be practiced. It is dangerous and likely to fail."
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