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Various proteins and their possible sources under research for drug-delivery applications: (A) silk from Bombyx mori cocoons; (B) resilin from dragonfly; (C) collagen from fish scales; (D) keratin from goat hairs. These proteins can be fabricated into various drug-delivery vehicles such as films, sponges, gels, fibers, nanoparticles and microneedles. (Reproduced with permission from Reference [7,8,10,11], ACS Publications and Elsevier.)
