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Functional, finite-sized assemblies of proteins in biology: (A) protein shells of clathrin (left) and viral capsids of Herpes simplex (right); (B) photonic nanostructures form by keratin aggregates in feather barbs of Plum-throated Continga (inset); and (C) finite-diameter fibers in reconstituted fibrin clot. Figures are adapted from (Heuser, 1980) (A, left) and (Baker et al., 2000) (A, right); (Prum et al., 2009) (B); and (Weisel, 2007).
