This week: Hannah Devlin explores how scientists are growing human brains in labs. Why are they so keen to explore the possibilities? What are the ethical concerns being raised by experts?
In the mid-1990s a special little mouse crept its way into media headlines. Pink, hairless and fragile-looking, the little animal looked every bit as you would expect a mouse to – with one exception. He had a human ear growing from his back. “Ear Mouse”, as he came to be known, hinted that scientists were on the brink of extraordinary new capabilities that included being able to grow body parts in the lab.