Miniature "human brains" have been grown in a lab in a feat scientists hope will transform the understanding of neurological disorders.
The pea-sized structures reached the same level of development as in a nine-week-old foetus, but are incapable of thought.
The study, published in the journal Nature, has already been used to gain insight into rare diseases.
Scientists at Institute of Molecular Biotechnology of the Austrian Academy of Sciences have now reproduced some of the earliest stages of the organ's development in the laboratory.
One of the researchers, Dr Juergen Knoblich, said: "What our organoids are good for is to model development of the brain and to study anything that causes a defect in development.
"Ultimately we would like to move towards more common disorders like schizophrenia or autism. They typically manifest themselves only in adults, but it has been shown that the underlying defects occur during the development of the brain."
Prof Paul Matthews, from Imperial College London, told the BBC: "I think it's just mindboggling. The idea that we can take a cell from a skin and turn it into, even though it's only the size of a pea, is starting to look like a brain and starting to show some of the behaviours of a tiny brain, I think is just extraordinary.
"It's a long way from conscience or awareness or responding to the outside world. There's always the spectre of what the future might hold, but this is primitive territory” according to Dr Zameel Cader.
Source: http://www.bbc.co.uk/news/health-23863544
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