Japan approves human-animal embryo experiments

The University of Tokyo approved a proposal led by Hiromisu Nakauchi to grow human stem cells in animal embryos, aiming to create animals with human organs for transplants. The research involves injecting human induced pluripotent stem cells into animal embryos lacking certain organ-producing genes. The embryos will be grown to near term, with specific timelines for mice, rats, and pigs. A past experiment successfully cured a diabetic mouse using a rat embryo. Ethical guidelines dictate the experiment will be halted if more than 30% of the animal's brain is human.

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