Figure 2
Representative 2-dimesional signal intensity maps visualizing the peptide profiles of (A) tryptic digest of deglycosylated serum, and (B) untreated serum, within the range of m/z 800-4000, and 25-110 minutes of retention time. An example of obvious peak appearance in deglycosylated serum is indicated by broken boxes. (C) and (D) display the expanded views of the closed box in deglycosylated sample and untreated sample, respectively. The rectangles outlining the MS signal represent peak detection and their color coordination represents peak clustering.