Miniature human-brain-like structures transplanted into rats can send signals and respond to environmental cues. Researchers grew the structures from human stem cells and then injected them into the brains of newborn rat pups. After six months, the organoids became fully integrated into the rat brains. The approach could lead to a way to test therapies for human brain disorders. But some researchers have ethical concerns about such experiments: creating rodent–human hybrids could harm the animals or produce animals with human-like brains
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Miniature human-brain-like structures transplanted into rats can send signals and respond to environmental cues. Researchers grew the structures from human stem cells and then injected them into the brains of newborn rat pups. After six months, the organoids became fully integrated into the rat brains. The approach could lead to a way to test therapies for human brain disorders. But some researchers have ethical concerns about such experiments: creating rodent–human hybrids could harm the animals or produce animals with human-like brains