| 21. | Even the scientists are not sure precisely how the chimeraplasts bring about genetic changes.
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| 22. | Typically many such genetic changes are required before cancer develops.
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| 23. | By comparison, the viruses and bacteria used in vaccines make no long-term genetic changes.
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| 24. | Another genetic change softened the outer hull on the kernel.
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| 25. | Different genetic changes involving the " Gli3 " gene can cause Greig cephalopolysyndactyly syndrome.
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| 26. | His first task was to persuade his professor of the reality of genetic change.
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| 27. | Tumor suppressor genes are often disabled by cancer-promoting genetic changes.
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| 28. | "It's to make precise genetic changes in cells ."
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| 29. | He said these genetic changes clearly play a role in extending life in those animals.
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| 30. | Researchers are working to determine which genetic changes may influence the risk of atrial fibrillation.
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