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.
Robert Briggs (scientist)
Robert Briggs (December 10, 1911 — March 4, 1983) was a scientist who, in 1952, together with Thomas Joseph King, cloned a frog by nuclear transfer of embryonic cells. The same technique, using somatic cells, was later used to create Dolly the Sheep. Their experiment was the first successful nuclear transplantation performed in metazoans. He was a scientist at the Institute for Cancer Research of the Lankenau Hospital Research Institute (now known as the Lankenau Institute for Medical Research) when the work was conducted.