The percentage of reactive microglial cells (CD68+ Iba-1+ cells) was significantly increased in the ADHD model (17.7 ± 2.5% and 6.3 ± 3.5% CD68+ of Iba-1+ cells for SHR Veh and WKY Veh, respectively). The gene discussed is CD68; the disease is attention deficit-hyperactivity disorder.