title: The structure of keratin protofibrils.
mesh_terms: D000818:Animals; D005241:Feathers; D066298:In Vitro Techniques; D007633:Keratins; D046911:Macromolecular Substances; D008854:Microscopy, Electron; D008962:Models, Theoretical; D013194:Staining and Labeling; D014465:Ultrasonics; D014935:Wool
chemical_list: D046911:Macromolecular Substances; D007633:Keratins