Declan and Helena O’Shea with twins Theon and Asha at home in Kilmihil, Co Clare. Photograph: Eamon Ward

Declan O’Shea was on holiday in Portugal in 2011 when he fell off a third-floor balcony while sleepwalking. He ended up in a coma for two weeks. When (...)

Developing human embryos, nucleated by somatic cell nuclear transfer, pictured in their third day of development. Biologists at Oregon Health & Science University have created human stem cells using cloning techniques. Photograph: Oregon Health & Science University/Reuters

This week brought the news that it is now possible to create tailored embryonic stem cells using cell cloning techniques, bringing the promise (...)

Photo issued by Cell Press showing how scientists have succeeded in obtaining stem cells from human embryos cloned from skin. Photograph:   Eric Baker/OHSU/PA

Embryonic stem cells are highly-prized because they can turn into any type of cell in the body, like heart cells, muscles or neurons. However, the (...)