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