6EIG:
reference: Structural insights into ion conduction by channelrhodopsin 2., Volkov O, Kovalev K, Polovinkin V, Borshchevskiy V, Bamann C, Astashkin R, Marin E, Popov A, Balandin T, Willbold D, Buldt G, Bamberg E, Gordeliy V, Science. 2017 Nov 24;358(6366). pii: 358/6366/eaan8862. doi:, 10.1126/science.aan8862. PMID: 29170206

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