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S2 values determined by Model-Free analysis are displayed as a surface representation of the structure of TAR for the C1′, C6 and C8 sites. Residues that could not be analyzed due to spectral overlap are shown in light grey. Sites exhibiting local motion are colored based upon their S2 value and the corresponding color in the above scale: (a) free TAR; (b) Arg–TAR; (c) linear peptide–TAR and (d) cyclic peptide–TAR complex.
