photo credit: PASCA LAB STANFORD MEDICINE Neuroscientists can take human skin cells in a lab setting and coax them into becoming stem cells, and subsequently induce them into becoming human brain cells. But those cells didn't grow to the size of and operate like human brain cells.
In recent tests, a clusters of these newly formed human brain cells have been transplanted onto the rapidly developing brains of days-old baby rats where the human brain cells grow along with those of the host. In four months the human brain clusters grew 9 times their original volume networked with and become incorporated into rat brain circuits. There they grew to become 30% of the brain hemisphere into which they were transplanted. The bioethicist Julian Savlescu comments below.
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