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United States Department of Agriculture

Agricultural Research Service

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Image Number K10345-1

Geneticist George Vandemark isolates DNA from a bean plant that will be examined with a polymerase chain reaction assay to determine whether it has the virus-resistant gene. The assay can be completed in 1 day, whereas greenhouse methods require up to 4 months to determine the same thing.

Photo by Stephen Ausmus.



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Last Modified: 5/23/2006
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