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Human Embryo Model: The 200 Best Inventions of 2023 | TIME

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B ecause of medical and ethical challenges, there’s much we don’t know about the first few weeks of human embryo development, says biologist Jacob Hanna of Israel’s Weizmann Institute of Science. Hanna’s team used naive stem cells treated with chemicals to nudge them into becoming four types of cells found in early embryos. One percent of the treated stem cells spontaneously formed a structure similar to a human fetus, which researchers allowed to grow for 14 days. While distinctly not human, the model is close enough to give researchers potential insights into fertility, miscarriage, and more, for the first time. CONTACT US AT LETTERS@TIME.COM. These cookies are necessary for the website to function and cannot be switched off in our systems. They are usually only set in response to actions made by you which amount to a request for services, such as setting your privacy preferences, logging in or filling in forms. You can set your browser to block or alert you about these cookies, b

Because of medical and ethical challenges, there’s much we don’t know about the first few weeks of human embryo development, says biologist Jacob Hanna of Israel’s Weizmann Institute of Science. Hanna’s team used naive stem cells treated with chemicals to nudge them into becoming four types of cells found in early embryos. One percent of the treated stem cells spontaneously formed a structure similar to a human fetus, which researchers allowed to grow for 14 days. While distinctly not human, the model is close enough to give researchers potential insights into fertility, miscarriage, and more,

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