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Abstract
1. Four major radioactive fractions have been isolated from the livers of vitamin A-deficient rats given [6,7-(14)C(2)]retinoic acid. 2. At least one of these was more potent than retinoic acid and approximately equal to retinol in the growth assay for vitamin A activity. 3. The biologically active material was chromatographically distinct from retinoic acid, retinol and retinal. 4. Alkaline hydrolysis of this material yielded an acidic compound containing all the radioactivity. 5. The methyl ester of the acidic product was unlike the methyl ester of retinoic acid in its chromatographic behaviour. 6. It is suggested that this metabolite may represent the active form of retinol in its growth-supporting role.
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