Scientists have made a major step forward to creating life in the laboratory without using sperm or eggs. Two different kinds of stem cells were combined in a dish - and they grew into an early form of embryo.
Creating embryos from stem cells would create an unlimited supply of identical embryos, which would be useful for medical research.
The development is hoped to shed light on one of the biggest causes of infertility - embryos failing to implant in the womb.
It will also be useful for testing the effects of new medical treatments. Researchers say that the technique - carried out in mice - could result in a mouse being created without using sperm or eggs within three years.
But experts warn that if the technique could be replicated in people, it may lead to the creation of an army of human clones.
It could take as long as two decades before the technique is likely to be perfected to create human embryos out of stem cells, the experts warned.
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