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. 2017 Jan 30;8:14310. doi: 10.1038/ncomms14310

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Copyright © 2017, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(a) Representative micrograph of PC-portal negatively stained with 1% uranyl formate (Scale bar, 1 μm). (b) Representative micrograph of frozen-hydrated PC-portals (Scale bar, 1 μm). (c) Selected, reference-free 2D class averages of frozen-hydrated particles showing top and side projection views of PC-portal. (d) A σ_A-weighted 2Fo–Fc difference electron density map computed at 3.30 Å resolution is displayed around a portion of the PC-portal protein model (Arg249–Val276), which is shown as sticks. The density is displayed as cyan mesh contoured at 1.65σ above background.