Early human development is a complex, multistep process that’s even more complicated to study in the lab. Models made from stem cells avoid some of the trouble with using real human embryos.
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In June, the possibility of synthetic embryos was announced at a conference. This allows some research to extend beyond the 14-day rule, which restricts experimentation on embryos beyond this period.
In April, scientists implanted synthetic monkey embryos in female monkeys. While none of them developed into fetuses, this is a new development that raises important ethical questions.
