Image of mouse embryos at the 2-cell stage visualised by light microscopy. Two blastomeres (cells) can be seen inside the zona pellucida (a “shell-like” protective outer layer) of each embryo. Credit: ...

It’s challenging to sustain a pregnancy when food is short, or conditions are otherwise tough. That’s why many mammalian embryos can postpone their growth to get through periods of environmental ...

In a world first, embryos have been sent to space so that scientists can study how zero-gravity affects a growing fetus. The mouse embryos were sent to the International Space Station to be raised by ...