title: Some current problems in the vitamin B12 field. Introduction to the symposium.
mesh_terms: D000818:Animals; D002846:Chromatography, Affinity; D002852:Chromatography, Ion Exchange; D006023:Glycoproteins / Q000378:metabolism; D006801:Humans; D007525:Isoelectric Focusing; D011485:Protein Binding; D014805:Vitamin B 12 / Q000031:analogs & derivatives / Q000276:immunology / Q000378:metabolism*
chemical_list: D006023:Glycoproteins; D014805:Vitamin B 12