It has been 20 years since Dolly the sheep was successfully cloned in Scotland, but cloning mammals remains a challenge. A new study of gene expression in developing clones now shows why most cloned embryos likely fail.
It has been 20 years since Dolly the sheep was successfully cloned in Scotland, but cloning mammals remains a challenge. A new study of gene expression in developing clones now shows why most cloned embryos likely fail.