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The inner structure of the collagen fibril. Contact mode AFM error signal image of digital tendon collagen fibrils (scale bar, 1 μm). The fibrils have “collapsed” onto the glass substrate and display their internal structure. This has a pleated or spiral conformation and closely resembles that of a rope, as shown in Fig. 4. The fibril presents a substructural pattern with an angle θ = (38.5 ± 8.0)°, n = 12 with respect to the long axis of the fibril (inset).
