title: A second look at vitamin D.
authors: Howard A
authors: HA
authors: Epstein
mesh_terms: D006801:Humans; D011110:Polymorphism, Genetic; D018167:Receptors, Calcitriol / Q000235:genetics / Q000502:physiology*; D012880:Skin Pigmentation / Q000502:physiology; D013472:Sunlight; D014807:Vitamin D / Q000097:blood / Q000502:physiology*
chemical_list: D018167:Receptors, Calcitriol; D014807:Vitamin D