title: [Comparative x-ray study of the species specificity of collagens].
abstract: The facts of isomorphism of collagens from a variety of species have been discovered; helical unit twist and unit height are practically constant in spite of a wide variation of amino acid composition. Collagen is isomorphous to fibrous form of modelling polytripeptides, at the same time helical unit twist of crystalline forms of (Pro-Pro-Gly)10 is different (although it is possible that the disagreement between fibrous and crystalline forms is a consequence of a specific diffraction effects).
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001717:Birds; D003094:Collagen / Q000032:analysis; D004284:Dogfish; D005399:Fishes; D006168:Guinea Pigs; D011487:Protein Conformation; D011895:Rana ridibunda; D011896:Rana temporaria; D051381:Rats; D012455:Salamandridae; D012867:Skin / Q000032:analysis; D013045:Species Specificity; D013710:Tendons / Q000032:analysis; D014961:X-Ray Diffraction
chemical_list: D003094:Collagen
vernacular_title: Sravnitel'noe rentgenograficheskoe issledovanie vidovoĭ spetsifichnosti kollagenov.