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. 2015 Jun 25;6:7564. doi: 10.1038/ncomms8564

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(a–c) The single polymer chain and (d–f) nanofibril with polymer chains composed in a possible 2 × 2 chain-packing structure. (a,d) AFM images with the tracked contours represented by blue lines that are slightly shifted for better visualization. (b,e) Height profiles along the tracked contours from a,d, respectively. (c,f) Height distributions of points along 20 tracked single cellulose polymer chains with the average height h=0.44 nm and s.d. σ_h=0.15 nm, and 2 × 2 cellulose nanofibril with the average height h=0.84 nm and s.d. σ_h=0.17 nm. Cutoffs at 1 nm (b,c) and 1.5 nm (e,f) were introduced to discard height data from chain-fibril crossings.