title: Characterization of cytosine nucleosides by mass spectrometry.
mesh_terms: D002849:Chromatography, Gas; D003562:Cytidine / Q000031:analogs & derivatives* / Q000032:analysis; D003903:Deuterium; D013058:Mass Spectrometry; D008722:Methods; D010103:Oxygen Isotopes; D014529:Uridine / Q000031:analogs & derivatives / Q000032:analysis
chemical_list: D010103:Oxygen Isotopes; D003562:Cytidine; D003903:Deuterium; D014529:Uridine