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The main forms of arginase Ai from human kidney and As from human liver were purified to homogeneity. Molecular weight of both forms of enzyme approximates 120000. In the presence of EDTA these arginases dissociate into single type distinct subunits. Mr of both kinds of subunits is 30000. Similarly as native arginase forms, they differ in electric charge and display complete immunological incompatibility.
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