Lawson, D E Biological activity of 1beta-hydroxy-vitamin D3. Implications for the steric structure of the active form of vitamin D. [electronic resource] - FEBS letters Aug 1977 - 137-40 p. digital Publication Type: Journal Article ISSN: 0014-5793 Standard No.: 10.1016/0014-5793(77)80424-9 doi Subjects--Topical Terms: AnimalsBiological AssayChickensHydroxycholecalciferols--bloodIsomerismMolecular ConformationStructure-Activity RelationshipVitamin D Deficiency--drug therapy