Date: 2010-02-06 05:16 am (UTC)
там же: "The embryo of a placental mammal is defined as the organism between the first division of the zygote (a fertilized ovum) until it becomes a fetus. In humans, the embryo is defined as the product of conception from implantation in the uterus through the eighth week of development."

то-есть, у людей (почему-то в отличии от животных), до имплантации - переходная стадия, еще не эмбрион, несмотря на расплывчатость определений.
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