From: Better score function for peptide identification with ETD MS/MS spectra
Ion
z'
c
y
z
b
a
Frequency
81.9%
79.9%
70.2%
45.3%
40.5%
37.9%
z'2+
y-H2O
C-H2O
z'-NH3
a-NH3
b-H2O
34.3%
30.8%
29.3%
27.2%
24.9%
24.5%