GABRB2 and schizophrenia: In the present study, Gabrb2-knockout mice of both homozygous (KO or Gabrb2−/−) and heterozygous (HT or Gabrb2+/−) genotypes were compared to wild-type (WT or Gabrb2+/+) mice regarding the possible presence of schizophrenia-like phenotypes.