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ROI-specific mass spectra in subject No. 1 are presented. Red peaks and blue peaks are derived from the hair section and background area, respectively. (A) ROI selection is illustrated: ROI A as hair section and ROI B as background area. (B) m/z 50 to 300. (C) m/z 125.99. (D) m/z 153.00. (E) m/z 164.00. (F) m/z 207.04.
