6V5A:
reference: Coupling of Ca(2+) and voltage activation in BK channels through the alphaB helix/voltage sensor interface., Geng Y, Deng Z, Zhang G, Budelli G, Butler A, Yuan P, Cui J, Salkoff L, Magleby KL, Proc Natl Acad Sci U S A. 2020 Jun 23;117(25):14512-14521. doi:, 10.1073/pnas.1908183117. Epub 2020 Jun 8. PMID: 32513714

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