title: Vitamin D, its metabolites and analogs: a review of the structural requirements for biological activity.
mesh_terms: D000818:Animals; D002118:Calcium / Q000378:metabolism; D055598:Chemical Phenomena; D002621:Chemistry; D002762:Cholecalciferol / Q000032:analysis / Q000502:physiology; D004100:Dihydroxycholecalciferols / Q000378:metabolism; D006801:Humans; D006887:Hydroxycholecalciferols; D007422:Intestines; D008968:Molecular Conformation; D011987:Receptors, Steroid; D013237:Stereoisomerism; D013329:Structure-Activity Relationship
chemical_list: D004100:Dihydroxycholecalciferols; D006887:Hydroxycholecalciferols; D011987:Receptors, Steroid; D002762:Cholecalciferol; D002118:Calcium