With innovative bioreactor as womb, mouse stem cells transform into organ-filled embryos | Science
What happens in embryonic development is one of nature’s best guarded secrets, unfolding deep in the mother’s body. Now, researchers have opened a new window on the process. They’ve made artificial mouse embryos from stem cells—no sperm or eggs required—and used an innovative bioreactor to nurture their creations for longer than any previous embryo models. The simulated embryos developed anatomy that matched the real thing and “very impressive similarities at the cellular level.…