title: Heterogeneity of aspartate aminotransferase (AAT) in bull semen.
abstract: Polymorphism of non-genetic character was discovered in aspartate aminotransferase (AAT) of bull semen. A relationship was found between the enzyme heterogeneity and susceptibility of plasmatic membranes of spermatozoa to cryogenic damage. The relation changed with the bull's age.
mesh_terms: D000818:Animals; D001219:Aspartate Aminotransferases / Q000235:genetics*; D002417:Cattle; D004589:Electrophoresis, Disc; D008297:Male; D010641:Phenotype; D011110:Polymorphism, Genetic; D012661:Semen / Q000201:enzymology*
chemical_list: D001219:Aspartate Aminotransferases