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Solid-state NMR structures of (a) Vpu from HIV-1 (PDB: 2N28 [127]), and (b) closed and open influenza BM2 channels in lipid membranes (PDB: 6pvr (pH 7.5) and 6pvt (pH 4.5) [130]). Panel (a) reprinted from reference [127] Copyright (2015), with permission from Elsevier. Panel (b) reprinted from reference [130] Copyright (2020), with permission from Springer Nature.
