Goodbye DollyIn February 2003, the decision was taken to "euthanase" six-year-old Dolly after a veterinary examination showed that she had a progressive lung disease.
Professor Ian Wilmut, who led the team that created her, said at the time that the arthritis showed their cloning techniques were "inefficient" and needed more work.
Dolly, the world's first cloned sheep, developed arthritis, raising fears that the cloning process may have given her a genetic defect. The news was a setback for those who argue that cloning can become an effective -- and lucrative -- medical technology, but boosted the case of ethicists and animal rights campaigners who say genetic intervention is irresponsible and dangerous. (Reuters Graphic) Dolly died in February after contracting a lung disease.