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. 2017 Feb 9;7:42303. doi: 10.1038/srep42303

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Cartoon representations of the X-ray crystal structures of NDH-2 highlighting the (A1) proton pathway through α-helices 1 and 7 of NDH-2 from S. aureus (PDB:4XDB⁷); (A2) alternative proton pathway in NDH-2 from S. aureus (PDB:4XDB⁷); (B) the proton pathway found for NDH-2 from C. thermarum (PDB:4NWZ⁶); (C) Proton pathway through α-helices 1 and 7 of NDH-2 from S. cerevisiae (PDB:4G73⁴). Membrane is represented in black.