we analyzed the stability of the enzymes alpha-amylase ( ec 3.2.1.1 ) , alkaline phosphatase ( ec 3.1.3.1 ) , alanine aminotransferase ( ec 2.6.1.2 ) , aspartate aminotransferase ( ec 2.6.1.1 ) , creatine kinase ( ec 2.7.3.2 ) , glutamate dehydrogenase ( ec 1.4.1.3 ) , gamma-glutamyltransferase ( ec 2.3.2.2 ) and lactate dehydrogenase ( ec 1.1.1.27 ) of a human serum pool during storage in liquid nitrogen for a period of 10 months .
C0030016
ec
C0022917
lactate