New definition of a human embryo proposed amid rapid scientific advances
An international group of scientists argue that recent advances justify a new definition for the human embryo.
When someone says the word embryo, what do you think of? Probably that picture you’ve seen a thousand times on a thousand different news articles: a translucent orb swelling with cytoplasm being prodded by a microinjection needle under the light of a microscope. The mainstreaming of IVF, or in vitro fertilization, has familiarized new generations of people with what the earliest stages of human development entails.
But earlier this summer, when scientists revealed they’re now able to create blobs of stem cells in the lab that self-organize into the same sorts of structures embryos themselves build during those first few weeks, it blasted wide open whatever ideas of the embryo we used to have. Were these structures embryo models, as some scientists named them, or something approaching actual embryos? How would anyone know when that line had been crossed?
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