Amniotic sac in a dish: Stem cells form structures that may aid of infertility research

The first few weeks after sperm meets egg still hold many mysteries. Among them: what causes the process to fail, leading to many cases of infertility. But scientists haven't had a good way to explore the biology behind this phenomenon. Now, a new achievement using human stem cells could give researchers a chance to see what they couldn't before, while avoiding ethical issues associated with studying actual embryos.

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