title: Isotopic assay of nanomole amounts of nitrogen-15 labeled amino acids by collision-induced dissociation mass spectrometry.
mesh_terms: D000596:Amino Acids / Q000032:analysis*; D013058:Mass Spectrometry / Q000379:methods; D008832:Microchemistry; D009587:Nitrogen Isotopes
chemical_list: D000596:Amino Acids; D009587:Nitrogen Isotopes