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United States Department of Agriculture

Agricultural Research Service

ARS Photo Library

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Image Number D152-1

These tiny (2 mm) round organs, called “root nodules,” are filled with specialized bacteria that capture nitrogen from the air and trade it to the legume plant for sugars the plant produces. The pinkish color comes from a compound similar to the hemoglobin in animal red blood cells.

Photo by Markus Dubach.



640 pixels wide: (d152-1.jpg)




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Last Modified: 5/23/2006
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