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SEM picture of a frontal section of rat medial collateral ligament of the knee. Collagen fibres run intertwined and fibrils are not running as parallel and densely packed as in tendons. When fibrils form crimps they always show fibrillar crimps. In fibrillar crimp regions all fibrils first twist leftwards and then bend changing first the plane and then the direction of running. Bar = 1 μm.
