DRD5 (Dopamine receptor D5)
The D5 subtype dopamine receptor (DRD5) stimulates adenyl cyclase and is expressed in the neurons of the limbic region of the brain. Polymorphisms in DRD5 have been highly associated with attention deficit hyperactivity disorder (ADHD). Humans have approximately 5 more copies of DRD5 than any other primate, but the significance of this change is not understood.
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