Good news, everyone!
"The mouse embryos only died after they became too large for the oxygen to diffuse through them, since they lack the natural blood supply a placenta could provide."
https://www.technologyreview.com/2021/03/17/1020969/mouse-embryo-grown-in-a-jar-humans-next/amp/?__twitter_impression=true
"The mouse embryos only died after they became too large for the oxygen to diffuse through them, since they lack the natural blood supply a placenta could provide."
https://www.technologyreview.com/2021/03/17/1020969/mouse-embryo-grown-in-a-jar-humans-next/amp/?__twitter_impression=true