Table 1. The parameters of database searches with the MASCOT search engine using the GSP Explore software.

Detabase	Swiss-Prot
Type of search	MS/MS Ion Search
Enzyme	No
Variable modifications	Carbamidomethyl (C),Oxidation (M)
Mass values	Monoisotopic
Protein Mass	Unrestricted
Peptide Mass Tolerance	±0.15 Da
Fragment Mass Tolerance	±0.3 Da
Instrument type	Default