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Schematic of recombinant silk processed into new biomaterials. The silk proteins can be solubilized with a variety of solvents, including formic acid, hexafluoroisopropanol, calcium nitrate, lithium salts, or ionic liquids. Once solubilized, the silk protein solutions can be processed into the range of different structures shown. Reproduced with permission from Ref.[57] Copyright 2008, Elsevier Ltd.
