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. 2012 Oct 17;103(8):1790–1801. doi: 10.1016/j.bpj.2012.09.009

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© 2012 by the Biophysical Society.

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Normal modes of the Ω loop (residues 161–179). In each normal mode, the average and extremum structures are shown in different colors. Arrow indicates average direction of motion. A, B, and C are the three first eigenvector for TEM-1 Ω loop. D, E, and F are the three first eigenvectors for PSE-4. In this figure, vectors for enzyme free forms are illustrated; normal modes for bound forms are similar (refer to discussion in main text). The relative amounts of motion represented by the eigenvectors are: TEM-1 free form: 26%, 17%, 12%; TEM-1-bound form: 33%, 28%, 19%; PSE-4 free form: 24%, 14%, 8%; PSE-4 bound form: 39%, 30%, 15%.