Abstract
Rats were subjected to a diet free from riboflavin and containing 1% succinylsulphathiazole. The D-amino-acid oxidase of the liver was rapidly and severely reduced in riboflavin deficiency and was rapidly and fully restored upon the admn. of riboflavin. The amine oxidase activity of the liver was halved in riboflavin deficiency. There was no rapid restoration of enzymic activity on giving riboflavin. If inositol was present in the diet, some restoration of amine oxidase occurred when riboflavin was admd.

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