. Author manuscript; available in PMC: 2010 Oct 25.

Published in final edited form as: Eur J Mass Spectrom (Chichester). 2010;16(3):421–428. doi: 10.1255/ejms.1028

Table 1.

Protein Prospector merged output of CID and ETD results. Since a 203.0-203.1 Da neutral loss was permitted, without defined elemental composition, the software calculates the mass difference between the precursor and the theoretical mass from the peptide sequence. The accurate mass increment for GalNAc (or any HexNAc) would be: 203.0794 Da.

m/z	z	ppm	Peptide	MS2	Score	Expect
678.3465	3	−2.4	VQLALRPSPT(HexNAc)SPPSENH	ETD	30.3	0.0020
1017.0150	2	0	VQLALRPSPTSPPSENH+203.0722	CID	30.9	2.6e-5
678.3465	3	0	VQLALRPSPTSPPSENH+203.0745	CID	23.9	0.16