The remaining six CNVs have not been associated with a diagnosis of ADHD before; the deletions at 2p16.3 (NRXN1), 16p11.2 distal, 16p12.1 and 17p12 and duplications at 17q12 and 22q11.21. This evidence concerns the gene NRXN1 and attention deficit-hyperactivity disorder.