title: Gas chromatographic-mass spectrometric characterization of N-methylated basic amino acids in human urine.
mesh_terms: D000596:Amino Acids / Q000652:urine*; D000818:Animals; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D006801:Humans; D008745:Methylation; D051381:Rats
chemical_list: D000596:Amino Acids