Ten Years after Dolly

July 5, 2006

It has been 10 years since Dolly the sheep was born, and Time this week carries an article delving into the topic of mammalian cloning.

A decade later, scientists are starting to come to grips with just how different Dolly was. Dozens of animals have been cloned since that first little lamb–mice, cats, cows, pigs, horses and, most recently, a dog–and it’s becoming increasingly clear that they are all, in one way or another, defective.