title: Isotopic determination of serum vitamin B12 level using Sephadex G-25.
mesh_terms: D002850:Chromatography, Gel; D003036:Cobalt Isotopes; D006801:Humans; D008722:Methods; D011485:Protein Binding; D014805:Vitamin B 12 / Q000097:blood*
chemical_list: D003036:Cobalt Isotopes; D014805:Vitamin B 12