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Clustering of the equilibrium population of the unacetylated (left column) and tetraacetylated (right column) H4 peptides. Rows a–c show the representative conformations of clusters 1–3, respectively. The color code represents different secondary structural elements as identified throuh a DSSP analysis (48). Purple, α-helix; blue, 310-helix; green, turn; orange, random coil.
