6BCO:
reference: Structures of the calcium-activated, non-selective cation channel TRPM4., Guo J, She J, Zeng W, Chen Q, Bai XC, Jiang Y, Nature. 2017 Dec 14;552(7684):205-209. doi: 10.1038/nature24997. Epub 2017 Dec 6. PMID: 29211714

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