2WJR:
reference: NanC Crystal Structure, a Model for Outer-Membrane Channels of the Acidic Sugar-Specific KdgM Porin Family., Wirth C, Condemine G, Boiteux C, Berneche S, Schirmer T, Peneff CM, J Mol Biol. 2009 Sep 29. PMID: 19796645

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