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19. Vitamin A degradation products encountered on vitamin A analysis. I. The structures of retrovitamin A, anhydrovitamin A, and isoanhydrovitamin A. Tsukida K, Ito M, Ikeda F. Int J Vitam Nutr Res; 1971 Mar; 41(2):158-70. PubMed ID: 5098359 [No Abstract] [Full Text] [Related]