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**FILE** Toxicologist David Black is shown in a lab of his company, Aegis Sciences Corp., in Nashville, Tenn., on Dec. 9, 2008. (Associated Press)
Photo by: Mark Humphrey
**FILE** Toxicologist David Black is shown in a lab of his company, Aegis Sciences Corp., in Nashville, Tenn., on Dec. 9, 2008. (Associated Press)

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