6OY3:
reference: Dynamic modulation of the lipid translocation groove generates a conductive ion channel in Ca(2+)-bound nhTMEM16., Khelashvili G, Falzone ME, Cheng X, Lee BC, Accardi A, Weinstein H, Nat Commun. 2019 Oct 31;10(1):4972. doi: 10.1038/s41467-019-12865-4. PMID: 31672969

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