‘Blastoids’ made of stem cells offer a new way to study fertility
Models of early-stage embryos could be used to research contraceptives too
![image of a blastoid sphere with blue and pink hues](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2021/12/120922_jb_blastoid_feat.jpg?fit=1030%2C580&ssl=1)
Human stem cells can be used to create models called blastoids (one shown that has been chemically altered to fluoresce) for studying how early-stage embryos implant into the lining of the uterus.
© N. Rivron/IMBA, Nature