| 31. | Forty developed to the blastocyst stage _ a collection of 100 to 300 cells.
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| 32. | However, the egg can split into two, but still have one blastocyst.
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| 33. | They explored the method of using blastocysts for the isolation of embryonic stem cells.
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| 34. | Thirty to fifty live mice are normally born from this number of injected blastocysts.
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| 35. | This ball of 16 cells then reorganizes into a hollow sphere called a blastocyst.
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| 36. | The expression of WDR90 in development is the highest in blastocyst and fetal stages.
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| 37. | But the harvesting involves destroying the blastocyst.
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| 38. | Within five days, there is a cluster of about 150 cells called the blastocyst.
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| 39. | Fertility centers hope they can be more sure of a pregnancy if they transfer blastocysts.
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| 40. | At 148 hours, early blastocysts form.
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