Summary: Figure 2. Radiometric assay of catalysis of epinephrine autoxidation by uric acid . Procedure: (Modification of the method of Axelrod.38) Control: 1.0 ml of 0.1 M phosphate buffer (pH 7.4) + .18 Mg MgS04 + 0.1 mg phenylisopropylhydrazine + 0.3 gCi DL-epinephrine-4-3H (
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