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(a) Total ion current chromatogram in MRM mode of a standard solution containing tagged amino acids. Two transitions were monitored for each analyte (see Table S-2). The LC conditions are given in experimental, section “Ultrahigh-Performance Liquid Chromatography.” (b) Total ion current chromatogram in MRM mode of a fine mode aerosol (< 2 μm) sample collected during Sep. 23–25 in 2015. The same LC conditions as in (a) were used
