2.3.1. Identification and quantification of the peptides
Multicharged (2+, 3+ and 4+) ion intensities were extracted from the LC–MS files and the Mascot Version 2.4 software (Matrix Science Ltd, UK) was used to compare the MS/MS data against the NCBI protein database (13/03/2013; 11,961,441 sequences). Search parameters used were a maximum missed-cut value of 2, variable oxidation (M), N-terminal protein acetylation and fixed carbamidomethylation (C), precursor mass tolerance 7 ppm and MS/MS tolerance 0.4 Da. A significance threshold (p) of