Figure 1.

Peptide fragmentation. (a) For every two adjacent amino acid residues, there are three positions where the peptide backbone can be fragmented, resulting in six types of ions. (b) Each ion type may generate a peak at the corresponding m/z value in the theoretical spectrum.

Liu et al. BMC Bioinformatics 2010 11(Suppl 1):S4   doi:10.1186/1471-2105-11-S1-S4