The first embryos from a mammal have now been grown in space
The research is a step toward understanding how human embryos might fare
![A microscope image of seven mouse blastocysts on a lavender background.](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2023/11/111723_si_mouse-embryos_feat.jpg?fit=1030%2C580&ssl=1)
Two-cell mouse embryos cultured on the International Space Station and returned to Earth formed blastocysts (some shown).
S. Wakayama et al/iScience 2023