For every step forward cloning makes, two steps backward seem to follow.
In the Feb. 21 Nature, researchers at Texas A&M University in College Station announced that they had cloned a cat, producing a seemingly healthy kitten they named "cc" for Carbon copy. This first cloning of a common domestic pet was funded primarily by a man who wants the researchers to clone his dead pet dog, Missy.
Two new studies raise questions about cc's future, however. In the March Nature Medicine, investigators from the University of Cincinnati College of Medicine report that their cloned mice regularly develop obesity. Even more disturbing, scientists at the National Institute for Infectious Diseases in Tokyo report in the March Nature Genetics that cloned animals may hav