Viable offspring derived from fetal and adult mammalian cells

July 5,1996- Dolly the sheep is cloned from adult stem cells by the Roslin Institute in Scotland and PPL Therapeutics. Dolly was cloned when Ian Wilmut, Keith Campbell, and their team of scientists transferred the nucleus of adult udder cells from a 6 year old Finn Dorset ewe into an unfertilized enucleated sheep egg. The nucleus and egg were fused together with an electric current to ensure the egg had a complete set of chromosomes, cultured in vitro, and then implanted into the uterus of a third sheep who brought Dolly to term (“Stem Cells”).