title: Vitamin A and retinoids: recent advances. Introduction, background, and general overview.
mesh_terms: D006801:Humans; D007408:Intestinal Absorption; D009751:Nutritional Requirements; D014212:Tretinoin / Q000378:metabolism; D014801:Vitamin A / Q000008:administration & dosage / Q000502:physiology*
chemical_list: D014801:Vitamin A; D014212:Tretinoin