Sir Ian Wilmut, the scientist who led the team that cloned Dolly the sheep in 1996, has died at 79. The University of Edinburgh, where he served as a professor before his 2012 retirement, announced his passing today. Dolly was the first successful cloning of a mammal from an adult somatic cell, demonstrating the viability of somatic cell nuclear transfer (SCNT). The controversial milestone helped pave the way for today’s research on regenerative medicine.