131057817 h4230238 professor ian wilmut with dolly

The use of human embryonic material was controversial and so research into so-called therapeutic cloning was banned in many countries, including several states in the US. But years after the birth of Dolly, Japanese researchers built on Prof Wilmut’s work and found a way of creating cells that behaved in the same way as embryonic stem cells without using cloning, called Induced Pluripotent Stem Cells (IPS).

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