title: Primitive haemoglobin.
abstract: The sequences of Petromyzon and Aplysia globins are compared with the postulated vertebrate and mollusc-vertebrate ancestors to see if differences exist in the rates of evolution of different types of residue positions. Between the mollusc-vertebrate ancestor and Aplysia globin there is no very striking pattern of changes except that the interior positions are relatively conserved. In the evolution of Petromyzon haemoglobin, the alpha 1 beta 2 contact area is relatively conserved. The homopolymeric binding of lamprey Hb seems to be a primitive function.
mesh_terms: D000818:Animals; D005075:Biological Evolution; D003062:Codon / Q000032:analysis; D005399:Fishes; D005914:Globins; D006454:Hemoglobins; D007798:Lampreys; D008974:Mollusca; D012333:RNA, Messenger / Q000032:analysis; D014714:Vertebrates
chemical_list: D003062:Codon; D006454:Hemoglobins; D012333:RNA, Messenger; D005914:Globins