Dolly the cloned sheep opened research doors in biotechnology.

LONDON -- Obituary: Dolly the Sheep, July, 5, 1996--Feb. 14, 2003.

The world's most famous sheep, Dolly--the first clone to be created from an adult cell--died Friday at age 6 and a half. She was put down after vets at the Roslin Institute in Edinburgh, Scotland, where she was born and lived, found she was suffering from a progressive lung disease.

The Roslin Institute said that while sheep can live to 11 or 12 years old, lung infections are common in animals that, like Dolly, have lived indoors.

After a post-mortem, Dolly is to be stuffed and exhibited in the National Museum of Scotland in Edinburgh. There she will join her cloned predecessor Morag, born …