Experimenting on naturally-produced human embryos isn’t an option in almost any case, for ethical reasons.
have grown “complete” models of human embryos from stem cells in the lab outside the womb
The very first days and weeks after a human egg is fertilized, where the cell divides, implants into the womb, and then begins the process of gastrulation – when the “plan” for the whole body is made, and when the different types of cell that become our muscles, bones, and organs are formed – are hugely significant.to the late biologist Lewis Wolpert about how “it is not birth, marriage or death, but gastrulation which is truly the most important time in your life”.
However, our understanding of gastrulation, and of the earlier stages of embryonic development, is nowhere near complete. Experimenting on naturally produced human embryos isn’t an option in almost any case, for ethical reasons.
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