Abstract
1. 1. The specific activities of the malate dehydrogenase and lactate dehydrogenase present in the soluble fraction of several guinea-pig tissues are reported. 2. 2. The electrophoretic patterns showed always two forms (A and B) with malate dehydrogenase activity and the five isoenzymes of lactate dehydrogenase. 3. 3. Chromatography of the different soluble fractions through 5′AMP-Sepharose allowed both molecular forms of malate dehydrogenase to be separated and obtained free from lactate dehydrogenase. 4. 4. Comparative studies of the two forms of malate dehydrogenase evidenced that the A and B forms exhibited cytosolic and mitochondrial characteristics, respectively.
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