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分子生物学研究阐明中枢神经系统中抑制性神经递质γ氨基丁酸 Ａ 型（ Ｇ Ａ Ｂ Ａ Ａ）受体由不同的蛋白质亚单位组合构成。至今，１５ 种亚单位，即６ 种α（α１α６ ）、３ 种β（β１β３）、３ 种γ（γ１γ３）、１ 种δ和２ 种ρ（ρ１ρ２）已被克隆和定序，而且还发现存在２ 种γ２（γ２ Ｓ和γ２ Ｌ）、２ 种β４及γ４亚单位形式。每个亚单位由位于不同染色体上的不同的基因编码，它们在脑中具有不同的而又可交叉的区域分布。不同区域的由不同亚单位组合的 Ｇ Ａ Ｂ Ａ Ａ 受体具有不同的药理学和生理学特征
Molecular biology studies have demonstrated that GABA receptor, an inhibitory neurotransmitter in the central nervous system, consists of a combination of different protein subunits. So far, 15 kinds of subunits, namely, 6 kinds of α (α1 6), 3 kinds of β β3 (β1 β3), 3 kinds of γ (γ1 γ3), a δ and two kinds of ρ (ρ1 2 ) Has been cloned and sequenced, but also found that there are two kinds of γ2 (γ2 S and γ2 L), two β4 and γ4 subunit forms. Each subunit is encoded by a different gene on a different chromosome that has a different but cross-sectional distribution in the brain. G A B A A receptors of different regions combined by different subunits have different pharmacological and physiological characteristics