title: Occurrence of anhydrovitamin A and retro-vitamin A in pharmaceuticals; their biological potency and effect on the assay of vitamin A.
mesh_terms: D000818:Animals; D001681:Biological Assay; D002845:Chromatography; D051381:Rats; D014801:Vitamin A / Q000494:pharmacology*; D014807:Vitamin D
chemical_list: D014801:Vitamin A; D014807:Vitamin D