Stem cells made from skin have become "grandparents" after generations of life were created in experiments by scientists in Japan.
The cells were used to create eggs, which were fertilised to produce baby mice. These later had their own babies. If the technique could be adapted for people, it could help infertile couples have children and even allow women to overcome the menopause.
But experts say many scientific and ethical hurdles must be overcome. Stem cells are able to become any other type of cell in the body from blood to bone, nerves to skin. Last year the team at Kyoto University managed to make viable sperm from stem cells. Now they have performed a similar feat with eggs.
They used stem cells from two sources: those collected from an embryo and skin-like cells which were reprogrammed into becoming stem cells. The first step, reported in the journal Science, was to turn the stem cells into early versions of eggs.
A "reconstituted ovary" was then built by surrounding the early eggs with other types of supporting cells which are normally found in an ovary. This was transplanted into female mice.
The first sign of possible extraterrestrials detected in the cosmos didn't come in the form of...
L ike many scientists, I came to the US as a young adult, driven by idealism...
Crows are able to look at a handful of four-sided shapes and correctly distinguish those that...
Nasa has dropped its longstanding public commitment to land the first woman and person of color...
