A Biological Definition of the Human Embryo
Attempts to define what an embryo is and when it comes into being face significant challenges due to the complexity of human development. Unlike mature humans, embryos are constantly in flux, with their composition and form changing dramatically over time. No obvious property or action defines an embryo at all stages of development.
KeywordsHuman Embryo Human Organism Inner Cell Mass Biological Entity Epigenetic State
The author thanks Thomas Berg and Christian Brugger for critical comments on the manuscript. This work was supported by a grant from the NIH, R01NS048382.
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