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. 2015 Jul 7;5:11927. doi: 10.1038/srep11927

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(A) Views from the extracellular side showing a cartoon (top panel; colored by B-factor) and a molecular surface model (bottom panel). (B) Cut-away surface view showing the internal channel. The constriction is indicated with an arrow. (C) Surface view from the extracellular side of Pput2725 lacking the N-terminus, showing a large channel. For comparison, a rainbow surface model is shown for E. coli NanC, which is involved in the uptake of N-acetylneuraminic acid.