title: An Ultramicronutritional Bio-Assay Technique Employing Seeded Agar Tubes.
authors.forename: M E
authors.initials: ME
authors.lastname: Shils
authors.forename: M
authors.initials: M
authors.lastname: Horowitz
authors.forename: A C
authors.initials: AC
authors.lastname: Gelman
authors.forename: M
authors.initials: M
authors.lastname: Sass
mesh_terms: D000362:Agar; D000596:Amino Acids / Q000032:analysis*; D014801:Vitamin A; D014815:Vitamins