| 1. | A : Totipotent stem cells form when a fertilized egg first divides.
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| 2. | Totipotent stem cells can develop into a complete individual.
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| 3. | Researchers have often called cells at this stage of development totipotent, Doerflinger said.
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| 4. | Totipotent cells are present in the morula up to the 16-cell stage.
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| 5. | Q : What are totipotent stem cells?
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| 6. | The human development model is one which can be used to describe how totipotent cells arise.
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| 7. | The difference between totipotent, pluripotent and multipotent stem cells may grow less significant as research proceeds.
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| 8. | A : After a few days, totipotent stem cells form a blastocyst, a ball of cells.
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| 9. | Most distinct cell types arise from a single totipotent cell, called a zygote, that division ).
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| 10. | Approximately four days after fertilization and after several cycles of cell division, these totipotent cells begin to specialize.
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