| 11. | Blastocyst _ A preimplantation embryo of 30 to 150 cells.
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| 12. | It has usually reached the blastocyst stage at the time of implantation.
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| 13. | In mammals the blastula is referred to as a blastocyst.
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| 14. | This results in a hollow ball of cells known as the blastocyst.
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| 15. | At this stage, the embryo is called a blastocyst.
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| 16. | The blastocyst reaches the uterus at roughly the fifth day after fertilization.
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| 17. | At this stage of prenatal development, the conceptus is a blastocyst.
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| 18. | As a result, they decided to work with cultured blastocyst cells.
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| 19. | Of the 16 blastocysts tested, two were absolutely perfect matches to Henry.
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| 20. | In 1998, scientists figured out how to harvest stem cells from blastocysts.
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