Fig. 1
From: Evaluation of open search methods based on theoretical mass spectra comparison
Example of in silico generation of a theoretical spectrum. The theoretical spectrum of peptide EAEISEK is composed of masses of the two main types of ions obtained by mass spectrometry: the b series (blue table) and y series (red table). A b-ion contains the N-terminal part of the peptide and is numbered according to the peptide sequence, from left to right. A y-ion contains the C-terminal part of the peptide and is numbered backwards according to the peptide sequence, from right to left. Masses are given in Daltons