3JAV:
reference: Gating machinery of InsPR channels revealed by electron cryomicroscopy., Fan G, Baker ML, Wang Z, Baker MR, Sinyagovskiy PA, Chiu W, Ludtke SJ, Serysheva II, Nature. 2015 Oct 12. doi: 10.1038/nature15249. PMID: 26458101

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