The oft-asked question "How is babby formed?" just got a little more complicated to answer. A team of Japanese researchers have reared baby mice who are the product of joining an artificial sperm cell and an artificial egg
. Both of the reproductive cells in question were made by transforming adult cells into induced pluripotent stem cells (iPSCs),
the lab created stem cell strains that have shown both promise and peril in recent studies. Those iPSCs were then turned into sperm and egg cells, respectively, and finally turned into adorable mouse pups.