Recent Work on Vitamin A

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    DURING the past two years advances have been made in our knowledge of the chemistry and properties of vitamin A and its relationship to certain other compounds, but progress, though steady, has not been so dramatic as in the case of vitamin D. Attention has been directed chiefly to methods of assay, both biological and chemical, to attempts at isolation of the vitamin, and to its formation under natural conditions: less work has been devoted to its physiological functions. In this article certain aspects of the subject will be briefly reviewed.

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