THREE pigs killed by sudden heart attacks are the latest illustration of the unexpected health problems that can afflict cloned animals.
Clones have developed many different illnesses, but the problems are unpredictable and can affect many organs. In contrast, the latest report suggests that pigs cloned using a new technique may consistently develop heart problems, says Xiangzhong “Jerry” Yang of the University of Connecticut in Storrs, who led the team that produced the piglets.
The animals had seemed completely healthy until their deaths at the age of about six months. Indeed, Yang’s team had submitted a paper, which will be…
