| 21. | A woman is required for the job to ensure that Y-chromosome DNA remains uncontaminated.
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| 22. | They have instead been managed to conserve the production of uncontaminated hot water for public use.
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| 23. | Mars and possibly Venus need to remain uncontaminated only until study by manned ships becomes possible .
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| 24. | The mountain air at the Greenbrier might be uncontaminated, but you still had to get there.
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| 25. | Martin said uncontaminated DNA samples from crime scenes, when properly handled, are extremely reliable evidence.
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| 26. | The environmental group Greenpeace, however, said fires can carry radioactive material to previously uncontaminated areas.
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| 27. | But food certified as uncontaminated still represents less than 1 percent of all food grown in China.
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| 28. | Nurses and doctors carried the children by hand to incubators in hospital wings uncontaminated by the gas.
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| 29. | The hazmat suit generally includes breathing air supplies to provide clean, uncontaminated air for the wearer.
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| 30. | The best source for uncontaminated DNA may be the tissue inside one of the mummy's teeth.
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