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http://www.msnbc.msn.com/id/15814732/from/RS.3/

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WASHINGTON - In a study that sheds light on the biology of aggression, scientists swapped genes in gender-bending fruit flies to make boys fight like girls, and girls fight like boys.

Researchers from Harvard Medical School and the Institute of Molecular Pathology in Vienna focused on a gene in fruit flies dubbed "fruitless," an important player in behavioral differences between the sexes of these insects.

The gene is known for its role in male courtship, but also controls another sex-specific behavior - how flies fight, according to the research appearing Sunday in the journal Nature Neuroscience.
Apparently the genetically modified male flies attempted to give the other flies eating disorders instead of just punching them.
 
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