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In this Thursday, Oct. 4, 2012 photo, an Aedes aegypti mosquito feeds on the arm of Emilio Posada, the Upper Keys supervisor for the Florida Keys Mosquito Control District, in Key Largo, Fla. Mosquito control officials in the Florida Keys are waiting for the federal government to sign off on an experiment that would release hundreds of thousands of genetically modified mosquitoes to reduce the risk of dengue fever in this tourist town. (AP Photo/Wilfredo Lee)

Associated Press
In this Thursday, Oct. 4, 2012 photo, an Aedes aegypti mosquito feeds on the arm of Emilio Posada, the Upper Keys supervisor for the Florida Keys Mosquito Control District, in Key Largo, Fla. Mosquito control officials in the Florida Keys are waiting for the federal government to sign off on an experiment that would release hundreds of thousands of genetically modified mosquitoes to reduce the risk of dengue fever in this tourist town. (AP Photo/Wilfredo Lee)
In this Thursday, Oct. 4, 2012 photo, an Aedes aegypti mosquito feeds on the arm of Emilio Posada, the Upper Keys supervisor for the Florida Keys Mosquito Control District, in Key Largo, Fla. Mosquito control officials in the Florida Keys are waiting for the federal government to sign off on an experiment that would release hundreds of thousands of genetically modified mosquitoes to reduce the risk of dengue fever in this tourist town. (AP Photo/Wilfredo Lee)
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