Biologists have successfully implanted artificial embryos into the uterus of monkeys.

The scientists placed eight to ten seven-day-old blastoids into the wombs of adult animals. They were then observed for three weeks. In three out of eight monkeys, such embryos caused pregnancy. However, within 20 days of the transfer, monkey blastoids stopped developing. This suggests that they are not yet perfect copies of ordinary embryos. Scientists hope such studies will tell us more about human pregnancy. As technology advances, researchers are likely to find ways to use stem cells to create more mature embryos.