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Study leader Dr Mike Modo, from the Institute of Psychiatry at King's College London, said: "This works really well because the stem cell-loaded particles can be injected through a very fine needle and then adopt the precise shape of the cavity.

"In this process the cells fill the cavity and can make connections with other cells, which helps to establish the tissue."

He said over a few days they were able to see cells migrating along the scaffold particles and forming a primitive brain tissue that interacts with the host brain.