Abstract
1. 1. Vitamin B 6-sufficient rats had moderate pyridoxamine-P oxidase specific activities in heart, brain, kidney and liver, but no detectable activity in skeletal muscle. Vitamin B 6-deficiency in rats resulted in a decreased oxidase activity in liver but no change in the activities in other tissues. 2. 2. The pyridoxamine-P oxidase activity in vitamin B 6-sufficient mice was high in liver, moderate in brain and kidney, and not measurable in skeletal muscle and heart. Vitamin B 6-deficient, compared with control mice, had decreased oxidase activities in brain, kidney and liver. 3. 3. Mouse erythrocytes took up pyridoxine more rapidly than did rat and human erythrocytes. 4. 4. Mouse and human erythrocytes rapidly converted pyridoxine to pyridoxal-P. Rat, hamster and rabbit erythrocytes had appreciably lower pyridoxamine-P oxidase activity than did mouse and human erythrocytes.
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