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Possible arrangements in a pentamer of subunits taken from three different types, α (yellow), β (red), and γ (green). There are three homomeric receptors, 18 receptors composed of two subunits, and 30 receptors composed of three different subunits. The receptor on the blue square represents the current consensus of the subunit arrangement in α1β2γ2 GABAA receptors as seen from the cell exterior.
