title: Chemical structure and the changing concept of vitamin A activity.
mesh_terms: D000818:Animals; D002352:Carrier Proteins / Q000378:metabolism; D002454:Cell Differentiation / Q000187:drug effects; D055598:Chemical Phenomena; D002621:Chemistry; D004848:Epithelium / Q000378:metabolism; D005260:Female; D006128:Growth / Q000187:drug effects; D006801:Humans; D007536:Isomerism; D008297:Male; D009369:Neoplasms / Q000517:prevention & control; D011247:Pregnancy; D018168:Receptors, Retinoic Acid; D012098:Reproduction / Q000187:drug effects; D012168:Retinal Pigments / Q000378:metabolism; D012172:Retinaldehyde / Q000378:metabolism; D012177:Retinol-Binding Proteins / Q000378:metabolism; D012871:Skin Diseases / Q000188:drug therapy; D013329:Structure-Activity Relationship; D014212:Tretinoin / Q000378:metabolism; D014801:Vitamin A / Q000009:adverse effects / Q000031:analogs & derivatives / Q000378:metabolism* / Q000627:therapeutic use; D014802:Vitamin A Deficiency / Q000378:metabolism
chemical_list: D002352:Carrier Proteins; D018168:Receptors, Retinoic Acid; D012168:Retinal Pigments; D012177:Retinol-Binding Proteins; D014801:Vitamin A; D014212:Tretinoin; D012172:Retinaldehyde