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New Research on Combined-Type ADHDThis study confirms that a specific haplotype of the dopamine transporter gene is associated with combined-type ADHD. Monday April 2nd - 10:20am Objective: The primary purpose of this study was to confirm the association of a specific haplotype of the dopamine transporter gene and attention deficit hyperactivity disorder (ADHD), which could be one source of the heterogeneity seen across published studies. Method: The authors previously reported the association of ADHD with a subgroup of chromosomes containing specific alleles of two variable-number tandem repeat polymorphisms within the 3' untranslated region and intron 8 of the dopamine transporter gene. They now report on this association in a sample of ADHD combined-type probands. Read the study results in the American Journal of Psychiatry 
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