Interestingly, PR55/Bγ (encoded by the PPP2R2C gene) is a pivotal phosphatase in the brain [9], and single-nucleotide polymorphisms (SNPs) of PPP2R2C are involved in several mental disorders, including ADHD, bipolar disorder and schizophrenia. The gene discussed is PPP2R2C; the disease is attention deficit-hyperactivity disorder.