title: Species adaptation in a protein molecule.
mesh_terms: D000222:Adaptation, Physiological; D000595:Amino Acid Sequence; D000663:Amphibians; D000818:Animals; D001717:Birds; D005399:Fishes; D006454:Hemoglobins / Q000235:genetics*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008322:Mammals; D008958:Models, Molecular; D010108:Oxyhemoglobins / Q000378:metabolism; D011487:Protein Conformation; D012104:Reptiles; D013045:Species Specificity
chemical_list: D006454:Hemoglobins; D010108:Oxyhemoglobins