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. 2013 Feb 28;9(2):e1002913. doi: 10.1371/journal.pcbi.1002913

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© 2013 Zhu et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Ribbon representations and schematic representations of the four states, with black N1; red C1; green N2; blue C2. Conformation is rendered transparent in the depictions of states , and to illustrate the differences.

Inline graphic — Ribbon representations and schematic representations of the four states, with black N1; red C1; green N2; blue C2. Conformation is rendered transparent in the depictions of states , and to illustrate the differences.