α
1
β
2
γ
2
|
Major (60%) synaptic |
Cerebral cortex (layer I–VI), hippocampus, striatum, cerebellum, amygdala, brainstem. |
α
2
β
n
γ
2
|
Minor (15–20%) synaptic |
Cerebral cortex (layers I–IV), hippocampus, striatum, hypothalamus, amygdala. |
α
3
β
n
γ
2
|
Minor (10–15%) synaptic |
Cerebral cortex (layers V-VI), hippocampus, cerebellum, amygdala, brainstem (including raphe nuclei and locus coeruleus), spinal cord. |
α
4
β
n
δ/γ
|
Minor (<10%) extrasynaptic |
Hippocampus (dentate gyrus), thalamus, cortex. |
α
5
β
n
γ
2
|
Minor (<5%) extrasynaptic |
Cerebral cortex, hippocampus, amygdala, hypothalamus, spinal cord. |
α
6
β
n
γ2/δ
|
Minor (<5%)(extra) synaptic |
Cerebellum. |