title: A contribution to the evolution of collagen.
mesh_terms: D000818:Animals; D005075:Biological Evolution; D002417:Cattle; D055598:Chemical Phenomena; D002621:Chemistry; D003063:Cnidaria; D003094:Collagen; D066298:In Vitro Techniques; D008854:Microscopy, Electron; D010455:Peptides; D012867:Skin
chemical_list: D010455:Peptides; D003094:Collagen