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The glyoxysomal isozyme of aspartate aminotransferase (EC 2.6.1.1: AAT1) was purified from soybean cotyledons. AAT1 was separated from other soybean AAT isozymes by DEAE ion exchange chromatography and then purified to electrophoretic homogeneity by immunoaffinity chromatography. The purified isozyme contained a single polypeptide as detected on SDS PAGE with an estimated M r of 42 000 Da...