Glycoprotein fish, blood serum

Fish living in Arctic and Antarctic waters may encounter temperatures as low as -1.9°C. The freezing point depression provided by dissolved salts and proteins in the blood is insufficient to protect the fish from freezing. As winter approaches, they synthesize and accumulate in their blood serum a series of eight or more special antifreeze proteins.a d One type of antifreeze glycoprotein from winter flounder contains the following unit repeated 17-50 times. 

Antifreeze glycoprotein is a collective name for a family of at least eight closely related glycoproteins that account for a major fraction of the protein in the blood serum of certain Antarctic fishes. The glycoproteins have been numbered according to the order of migration of... 

---