University of Nottingham biologist Keith Campbell, who was part of the effort to clone Dolly the sheep, has died, the Associated Press reports. Campbell was 58. Along with Ian Wilmut, Campbell and their colleagues cloned Dolly in 1996 from an adult mammary cell. The work was done at the Roslin Institute in Scotland, where Campbell then worked. The AP notes that Dolly, who was euthanized in 2003 after developing lung disease, both "captured the public imagination" and drew "anger from some who raised questions about the ethics of cloning." Campbell continued studies cloning after he moved to Nottingham, and said in a 2001 interview that embryonic stem cells would be a boon to medicine. "Broadly, I would say they may be a major breakthrough in human medicine that will improve the quality of life for a large number of the population, particularly those with age-related disorders," Campbell said.