An embryo is a multicellular diploid eukaryote in its earliest stage of development, from the time of first cell division until birth, hatching, or germination. In humans, it is called an embryo until about eight weeks after fertilization (i.e. ten weeks after the last menstrual period or LMP), and from then it is instead called a fetus. The development of the embryo is called embryogenesis.
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A new test promises to fan the flames of ethical debate surrounding designer babies. For the first time, couples undergoing ...