Engineering Animals to Grow Human Organs — But Not Human Minds

A chimera is an organism made up of cells from two or more different individuals.

In this context, scientists are creating animal chimeras by engineering animals to grow human organs inside their bodies.

This is done by injecting human stem cells into animal embryos, which then develop with a mix of animal and human cells.

The goal is to produce organs like kidneys or livers that are compatible with human patients, reducing the risk of rejection during transplants.

For example, in 2023, researchers successfully grew a human pancreas inside a pig embryo, though the organ was not fully developed.

This technique relies on stem cells, which are cells that can turn into any type of cell in the body, and embryos, which are the earliest stage of development in an organism.

The ethical and technical challenges of this approach are significant, as it requires precise control over cell development to ensure the organ functions correctly.