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. 2003 May;121(5):375–398. doi: 10.1085/jgp.200208746

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Copyright © 2003, The Rockefeller University Press

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Figure 3. — Effect of external Ba²⁺ on single BK channels in PE vs. PS bilayers. Examples of current records at 20 mV in PE (A) or PS (B) bilayers in the presence of 0, 2, or 20 mM BaCl₂ on the external side. Conditions: symmetrical 100 mM KCl and 10 mM Hepes-KOH, pH 7.2, internal 200 μM CaCl₂, and various concentrations of BaCl₂ on the external side as indicated. Records are filtered at 20 Hz and the dashed line indicates the closed current level.