Normal (left) versus cancerous (right) mammography image.

Courtesy of the National Cancer Institute. http://history.nih.gov/exhibits/genetics/sect2.htm

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	This image is a work of the National Institutes of Health, part of the United States Department of Health and Human Services, taken or made as part of an employee's official duties. As a work of the U.S. federal government, the image is in the public domain. Please ensure that this image was actually created by the US Federal government. The NIH frequently uses commercial images which are not public domain.
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