'Metabolic pool' and the use of 15N-labelled amino acids.
D000596:Amino Acids / Q000378:metabolism; D006801:Humans; D007700:Kinetics; D009584:Nitrogen / Q000378:metabolism*; D009587:Nitrogen Isotopes
D000596:Amino Acids; D009587:Nitrogen Isotopes; D009584:Nitrogen