GABRB2 and schizophrenia: Some of the other results suggesting GABAergic neuropathology in schizophrenia include lower GABA levels in plasma of subjects with schizophrenia [199], down-regulation of prefrontal GABAA receptor α5 subunit mRNA [382], and the associations of different polymorphisms and haplotypes in the GABAA receptor β2 subunit gene (GABRB2) with schizophrenia [383].