He hasn't been able to lay a new foundation, he said, because the national government keeps changing the requirements for soil testing and foundation design in his zone.

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Hajduch and his colleagues in Ukraine conducted a proteomic study (examining the structure and function of proteins) of the plants and found that the seeds harvested inside the exclusion zone compared favorably with ones grown in non-contaminated soil outside.

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Some elevated levels have been found in soil samples 25 miles northwest of the plant, although no plans were reported to expand the safety zone.

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