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Dear Donna Kipp: The article you refer to says that the University of Chicago announced last month that they have associated a specific gene with the most common behavioral disorder of childhood: attention deficit hyperactivity disorder. The discovery, which links the disorder to a gene that regulates the action of the neurotransmitter dopamine, could soon pinpoint the biological cause of a problem that confounds researchers. They haven't bagged the gene, but did find a marker. Barbara Yacos <[log in to unmask]>