title: Simultaneous measurement of endogenous and deuterium-labeled tracer variants of choline and acetylcholine in subpicomole quantities by gas chromatography-mass spectrometry.
mesh_terms: D000109:Acetylcholine / Q000032:analysis*; D002794:Choline / Q000032:analysis*; D002849:Chromatography, Gas; D003903:Deuterium; D005069:Evaluation Studies as Topic; D007553:Isotope Labeling; D013058:Mass Spectrometry; D008433:Mathematics; D008722:Methods; D008832:Microchemistry
chemical_list: D003903:Deuterium; D002794:Choline; D000109:Acetylcholine