The first human embryo-like structures have been created from stem cells, in a move that could help scientists study the causes of early miscarriages
. On 14 June, she announced her team had grown the human versions to a stage at which a real embryo would implant into
“In real embryos this [is equivalent to] a stage between day 7/8 and day 14,” says Żernicka-Goetz. She presented her work at the International Society for Stem Cell Research’s annual meeting in Boston, Massachusetts, as reported byOne reason is they can be made in unlimited numbers, while spare IVF embryos, which are used in early developmental research, are in short supply.
issues around working with something that could, in some circumstances, grow into a fetus. These rules don’t apply to synthetic embryos, so this could let researchers study embryo development for longer.These are already being drawn up in the UK, but nothing has been announced elsewhere, including in the US. In the UK, scientists, such as Żernicka-Goetz, have formed a working group along with legal experts, patient representatives and ethicists to discuss what new rules should apply.
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