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A lot of research has been done investigating the possible genetic roots of OCD. Neurotransmitter.net has a lot of the extensive studies done on OCD. LONG story short, some strands of genes can cause the brain to send and recieve different kinds of neurotransmitters and/or chemicals. These imbalances cause the series of compulsions and obsessions that the mind thinks need to be fullfilled. Studies with many different cases point to the genes possibly being inherited. A gene stand called 5HT was found in many kids with OCD. Parents were then studied and found to have this gene as well. This article on Genes and OCD http://www.eurekalert.org/pub_releases/2002-09/mp-agc082202.phpsays that serotonin is the primary chemical that the gene causes to become imbalanced in the brain.
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