A mosquito is held by tweezers, June 20, 2001, in Portland, Maine. Mosquitoes carrying a manmade gene were largely unable to transmit malaria to mice in a new experiment, say scientists who suggest spreading such genes among wild mosquito populations could help control the deadly disease. The work is reported in Thursday's issue of the journal Nature by a scientific team led by Marcelo Jacobs-Lorena, a Case Western Reserve University geneticist. (KEYSTONE/AP Photo/Robert F. Bukaty)
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