An illustration of a kidney and samples are shown in the Investigational Pathology lab at the U.S. Food and Drug Administration (FDA) headquarters in Silver Spring, Maryland, November 5, 2009. Reuters Pictures 3 weeks ago

An illustration of a kidney and samples are shown in the Investigational Pathology lab at the U.S. Food and Drug Administration (FDA) headquarters in Silver Spring, Maryland, November 5, 2009.