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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Articles on Embryogenesis
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An epigenetic model of cancer that incorporates the concept of stochasticity could also explain why cancer risk increases with age and how biological development can be reversible.
Human embryos are far more likely to die than come to term, an evolutionary trait seen across species. Laws granting personhood at conception ignore built-in embryo loss, with potentially grave consequences.
