March 16, 1997

Dolly the Sheep – the first mammal successfully cloned from an adult cell – was first presented to the world 15 years ago and she had people and politicians scared.
The sheep was cloned from the mammary gland cell of a 6-year-old sheep and so named Dolly in a nod to Dolly Parton.

http://www.northjersey.com/community/history/back_in_the_day/144179805_Back_in_the_Day_-_March_16__1997__World_says__Hello__to_Dolly.html