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.

What is the primary goal of the University of Tokyo's proposal involving human stem cells in animal embryos?

• To develop animals with human organs for transplants

• To study animal behavior

• To enhance the lifespan of animals

• To create animals with human-like intelligence

Which type of cells are used to develop organs in the animal embryos?

• Induced pluripotent stem cells

• Adult stem cells

• Neural stem cells

• Embryonic stem cells

How long are rat embryos grown in the experiment?

• 10.5 days

• 15.5 days

• 14.5 days

• 20.5 days

What was the outcome of Nakauchi's 2017 experiment with a diabetic mouse?

• The mouse's diabetes worsened

• The mouse developed a new heart

• The mouse's lifespan was shortened

• The mouse was cured by growing a new pancreas

What condition will lead to the suspension of the experiment?

• If more than 30% of the animal's brain is human

• If the animal's lifespan is reduced

• If the animal's organs do not function properly

• If the animal develops a new disease