Scientists create monkey chimera with human cells

The study published in the journal Cell details the implantation of human cells into monkey embryos, creating chimeras. The process involved reprogramming mature cells into stem cell-like states. Initially, 132 chimeric embryos were formed, with human cells comprising about 4% of the embryos. Over time, the number of viable embryos decreased, and all were destroyed by day 20 for ethical reasons. Researchers consulted bioethicists and chose to grow the embryos in a lab environment, preventing further development.

What was the initial step in the process of creating human-monkey chimeras?

• Growing embryos in a surrogate

• Consulting with bioethicists

• Reprogramming mature skin or blood cells into a stem cell-like state

• Implanting human cells into monkey embryos

How many reprogrammed human cells were added to the monkey embryos?

• 50

• 100

• 25

• 10

What percentage of the chimera embryos was made up of human cells?

• 1%

• 4%

• 2%

• 10%

By day 19, how many chimeras were still alive?

• All of them

• Ten

• Three

• None

Why were the hybrid embryos destroyed by day 20?

• Due to lack of funding

• Because they were fully developed

• To make room for new experiments

• For ethical reasons