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(a) Chemical structure of chitin. (b) Molecular models of the crystal structure of α-chitin and β-chitin showing the antiparallel and parallel chain directionality. Modified from [5]. (c) Electron diffractograms of highly crystalline chitin are taken on the grasping spine of Sagitta, left [6], and Tevnia jerichonana microcrystals, right [7]. (Online version in colour.)
