| 21. | The blastocyst is not the only place in which stem cells are found.
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| 22. | The outer layer of the blastocyst consists of cells collectively called the trophoblast.
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| 23. | First, only approximately half of the preimplantation embryos reach the blastocyst stage.
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| 24. | Three of those, the most viable, made it to the blastocyst stage.
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| 25. | Patients who had undergone fertility treatment donated the blastocysts to be used in research.
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| 26. | Stem cells in the blastocyst can divide indefinitely.
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| 27. | To them, destroying a blastocyst is murder.
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| 28. | Ethical controversies arise because the blastocyst is destroyed when the stem cells are removed.
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| 29. | They are attempting to define a blastocyst as a human being under the Constitution,
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| 30. | Eighty blastocysts were placed into 80 unrelated cows.
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