For example, as psychiatrist and workshop participant Laurence Greenhill pointed out, researchers recently reported that a gene variant, which codes for a dopamine receptor (the DRD4 7-repeat allele) and was formerly thought to be a genetic marker for ADHD, is also associated with thinning of the cortex in regions associated with attention control [20]. The gene discussed is DRD4; the disease is attention deficit-hyperactivity disorder.