| adaptation of bird hemoglobins to high altitudes: demonstration of molecular mechanism by protein engineering. | of two closely related species of geese, one, the greylag goose, lives in the indian plains all year round, while the other, the bar-headed goose, lives at the tibetan lakes and migrates across the himalayas to winter in india. another species, the andean goose, lives in the high andes all year round. possession of a hb with high oxygen affinity helps to adapt bar-headed and andean geese to high altitudes. the hb amino acid sequences of the bar-headed and the greylag geese differ by four substit ... | 1991 | 1862080 |