Abstract
2-Methyl-3-hydroxy-4-methoxy-methyl-5-hydroxymethylpyridine (methoxypyridoxine) has the same order of antipyridoxine activity as desoxypyri-doxine in chicks. In these expts., approx. 4 moles of methoxypyridoxine counteracted the vit. activity of 1 mole of pyridoxine when suboptimal or optimal amts. of the vit. were given to pyridoxine-deficient chicks.

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