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Fibers of engineered spider silk proteins assembled in a microfluidic device: micrographs of fibrous eADF3 (in water). Dark and bright spots in crossed-polarizers microscopy reveal areas of higher and lower molecular orientation. By reversing the direction of flow in the microfluidic device, eADF3 fibers can be collapsed into small coils. Obtained fibers are quite flexible and able to bear large curvatures. (Scale bar: 10 μm.)
