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Table 2 The frequencies that different fragment ion types have observed peaks in the training ETD data.
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%
Ion
z'
2+
y-H
2
O
C-H
2
O
z'-NH
3
a-
NH3
b-H
2
O
Frequency
34.3%
30.8%
29.3%
27.2%
24.9%
24.5%
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