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Mouse BK α and β4 subunits. A, Scheme of the threading of BK α through the membrane. The residues substituted by Cys in the extracellular regions flanking S0–S6 are labeled. B, Scheme of the threading of BK β4 through the membrane. The residues substituted by Cys in the extracellular regions flanking TM1 through TM2 are labeled.
