ARTN and attention deficit-hyperactivity disorder: The ADHD risk alleles are associated with increased expression of ARTN (in cerebellum and a subcortical region) and PIDD1 (in cerebellum and cortex) and with decreased expression of C2orf82 (in cortical, subcortical, and cerebellar regions) (Figs. 2–4 and Tables 1 and S3).