Figure 2: XIC of predicted citrullinated and non-citrullinated tryptic peptides +/- m/z 0.01, before and after tryptic digestion of SP 10 and SP 10Cit, with the sequence aa 480-499. For digested SP 10, the fragments aa 489-495 and aa 496-499 are detected, confirming a cleavage after aa 495Arg. For digested SP 10cit, the fragment aa 489-499 is detected, confirming a missed cleavage after aa 495Cit.