Figure 1From: Blind search for post-translational modifications and amino acid substitutions using peptide mass fingerprints from two proteasesOverlapping peptides. The peptides p1 and p2 define different regions (X, Y, Z) of the covered area as explained in the text. The figure also indicates that if adjacent peptides p3 and p4 are found, they can be combined with p2 and p1, respectively, to strengthen the probability for found mass shifts in X or Z being real mass shifts.Back to article page