单词	pre-embryo
释义	pre-embryo /priːˈɛmbrɪəʊ / noun technical A human embryo or fertilized ovum in the first fourteen days after fertilization, before implantation in the womb has occurred.The embryos, or pre-embryos, at fertility clinics are frozen at sometime between two and five days after fertilization.... Before fourteen days, the embryo, or pre-embryo as it was scientifically known, was a loose cluster of first two, then four, then sixteen cells, undifferentiated. Implantation of the pre-embryo in the uterine wall is a highly invasive process, akin to attack by a parasite. Derivatives pre-embryonic adjective ... Therapeutic cloning, on the other hand, is a technique in which pre-embryonic tissue cloned from human donors who are suffering from a variety of diseases like Parkinson's, Alzheimer's and diabetes would be used to produce stem cells.
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