Chinese researchers have cloned the first rhesus monkey, a species widely used in medical research because its physiology is similar to humans.
They say they could speed up drug testing, as genetically identical animals give like-for-like results, providing greater certainty in trials.
Previous attempts to clone a rhesus have either not led to births or the offspring have died a few hours later.
One animal welfare group has said it is "deeply concerned" by the development.
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