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A: mass spectrometric chromatogram demonstrating detection of urea, adenosine (Ado), adenosine monophosphate (AMP), and phenylalanine (Phe), as well as stable isotopically labeled (13C- and/or 15N-labeled) internal standards within an exhaled breath condensate (EBC) sample. B: EBC Ado/Urea was reproducible in replicate samples obtained on the same day (r = 0.62, P < 0.01, n = 20).
