title: Two-dimensional combination of the hydrogen and the ammonium forms of a cation-exchange layer for the separation of minor nucleic acid bases.
mesh_terms: D000225:Adenine / Q000031:analogs & derivatives / Q000032:analysis; D002411:Cation Exchange Resins; D002855:Chromatography, Thin Layer; D003596:Cytosine / Q000031:analogs & derivatives / Q000032:analysis; D006859:Hydrogen; D007042:Hypoxanthines / Q000032:analysis; D007475:Ion Exchange Resins; D011687:Purines / Q000032:analysis*; D011743:Pyrimidines / Q000032:analysis*; D000644:Quaternary Ammonium Compounds; D014498:Uracil / Q000031:analogs & derivatives / Q000032:analysis; D014970:Xanthines / Q000032:analysis
chemical_list: D002411:Cation Exchange Resins; D007042:Hypoxanthines; D007475:Ion Exchange Resins; D011687:Purines; D011743:Pyrimidines; D000644:Quaternary Ammonium Compounds; D014970:Xanthines; D014498:Uracil; D006859:Hydrogen; D003596:Cytosine; D000225:Adenine