By Meghan Bartels – Scientific American
Scientists have just achieved a milestone in stem-cell biology after creating a monkey from two embryos. And proof of the achievement, perhaps unnervingly, showed up in the infant primate’s eerie green glow.
Although research labs have created such “chimeras,” or organisms with cells from two distinct sources, in rats and mice, monkeys have been more challenging to work with because of their increased biological complexity and longer gestation and maturation time.
