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Mini Human Brains Have Been Implanted Into the Brains of Rodents

Researchers have grafted human brain organoids into rodent brains — a breakthrough with great scientific promise and immense ethical significance.

A cross section of a stem cell-derived cerebral organoid where the radial glia stem cells are shown in red, neurons in blue, and the AXL receptors are in green. | Elizabeth Di Lullo
Cross section of a brain organoid used in Zika virus research | UC San Diego Health
A cross section of a human brain showS the inner and outer components of the cerebellum. | In Pictures Ltd./Corbis via Getty Images