title: De novo origin of periodic proteins.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D005075:Biological Evolution; D012831:Bombyx; D003094:Collagen; D004247:DNA / Q000096:biosynthesis; D005349:Fibroins; D005399:Fishes; D006023:Glycoproteins / Q000097:blood*; D007313:Insecta; D007633:Keratins; D011479:Protamines; D051381:Rats; D012756:Sheep; D013045:Species Specificity
chemical_list: D006023:Glycoproteins; D011479:Protamines; D007633:Keratins; D003094:Collagen; D004247:DNA; D005349:Fibroins