title: Preface.
authors.affiliation: North Hollywood, California.
authors.forename: Gerald
authors.initials: G
authors.lastname: Litwack
mesh_terms: D002117:Calcitriol / Q000378:metabolism*; D005786:Gene Expression Regulation; D006801:Humans; D018167:Receptors, Calcitriol / Q000378:metabolism*; D013472:Sunlight; D014807:Vitamin D / Q000096:biosynthesis* / Q000378:metabolism
chemical_list: D018167:Receptors, Calcitriol; D014807:Vitamin D; D002117:Calcitriol