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. 2015 Apr 18;6(6):423–433. doi: 10.1007/s13238-015-0155-3

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© The Author(s) 2015

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Principal component analysis. (A) Eigenvalue profiles constructed by the first 30 eigenvectors from PCA analysis of sim-K1 and sim-K2, which were represented by black and green lines, respectively. (B) two-dimensional projection of backbone atomic trajectories along the first two eigenvectors, projections in sim-K1 and sim-K2 were represented by black and green dots, respectively. (C and D) respectively show the dominant motions along the first eigenvector in sim-K1 and sim-K2 by porcupine plot