History of animal testing
In 1996 Dolly the sheep was born, the first mammal to be cloned from an adult cell. The process by which Dolly the sheep was cloned utilized a process known as nuclear transfer applied by lead scientist Ian Wilmut. Although other scientists were not immediately able to replicate the experiment, Wilmut argued that the experiment was indeed repeatable, given a timeframe of over a year.
Ian Wilmut
Wilmut led the team that created Dolly, but in 2006 admitted his colleague Keith Campbell deserved "66 per cent" of the invention that made Dolly's birth possible, and that the statement "I did not create Dolly" was accurate. His supervisory role is consistent with the post of principal investigator held by Wilmut at the time of Dolly's creation.