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Micron-scale entanglement of two collagen fibrils. Contact mode AFM error signal image of digital tendon collagen fibrils (scale bar, 2.5 μm) (higher magnification, inset). Two fibrils are entangled, presenting a two-ply rope structure as predicted from the model. This finding suggests that the rope model could be applied to the entire hierarchy of the collagen structure and not only to the evolution of the microfibril to fibril.
