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Native and synthetic spider silk fibers. (a) Native N. clavipes major ampullate fiber has a diameter of 4 µm. (b) MaSp 2-like synthetic spider silk fibers. Notice the highly variable appearance and much larger diameter compared with native fibers. (c) Synthetic spider silk blend produced by extrusion of a 15% (wt/vol) MaSp 1/MaSp 2 spinning dope. These photos were taken using a Nikon Eclipse E200 microscope at ×40 original magnification.
