439690.fig.004a
(a)
439690.fig.004b
(b)
439690.fig.004c
(c)
Figure 4: Identification of a selected biomarker (m/z 162.1129). (a) Extracted ion chromatogram (EIC) of m/z 162.113 (  min); (b) MS/MS spectrum of the ion; (c) MS/MS spectrum of a commercial standard carnitine. The collision energy was 10 V.