without liberation of intracellular enzymes such as lactate dehydrogenase ( ec 1.1.1.27 ) the shedded membranes contained 15 -- 25 % of the total activity of the plasma membrane enzymes alkaline phosphatase ( ec 3.1.3.1 ) , nucleotide pyrophosphatase ( ec 3.1.4.1 ) and gamma-glutamyl transferase ( ec 2.3.2.2 ) .
C0022917
lactate dehydrogenase
C0030016
ec