embryo

She became pregnant with the first embryo and everything seemed to be progressing normally and both women allowed themselves to believe the future they'd imagined was finally happening.

More than one million embryos now sit in U.S. storage facilities, up from roughly 400,000 in 2002, according to the American Society for Reproductive Medicine.

The practice is currently used at a smaller scale in day-to-day medicine, where living cells such as blood cells, sperm and embryos are frozen at ultra-low temperatures to be stored.

In clinical terms, IVF involves removing eggs from a woman, fertilizing them in a lab with sperm and implanting embryos in the uterus.

They are working toward creating a child born from an embryo edited to prevent a hereditary disease.