Dolly the cloned sheep

July 5, 1996

At the Roslin Institute in Scotland, scientists created a sheep from a single mammary cell of a six-year-old ewe, the first mammal cloned from an adult cell. Dolly looked ordinary, but her existence proved that adult mammalian cells could be reprogrammed to make an entire body. Ethics committees scrambled. The word cloning entered the kitchen-table vocabulary and stayed there.