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Skin–core, fibril bundle structure of spider silk. (a) Schematic of the multi-fibril core of dragline silk that constitutes a spider web, on the order of micrometres, the scale investigated here. (b) Low magnification view of fracture surfaces of Argiope trifasciata fibres showing a skin–core nanofibrillar, globular microstructure. Image from Poza et al. [39], used with permission, copyright 2002, Elsevier Inc. (Online version in colour.)
