Therefore, BK tetrameric groups can be placed into four categories of alcohol sensitivity (color-coded in Figure 7A and 7B): 1) assemblies with at least one STREX, yielding alcohol resistant channels (red), 2) ALCOREX homomers – highly activated by alcohol (light green), 3) INSERTLESS homomers – low potentiation by alcohol (dark green), and 4) ALCOREX/INSERTLESS heteromers – for which the relative alcohol sensitivity is unknown (medium green).