*3.6. Peptide Mass Fingerprinting*

Protein bands were excised from SDS gels, dried, and tryptically hydrolysed. The resulting peptides were extracted and purified according to standard protocols and the amino acid sequence was analyzed with electrospray ionization-tandem mass spectrometry (ESI-MS/MS) using a maXis quadrupole time of flight (QTOF) mass spectrometer (Bruker, Bremen, Germany) as described previously [43,44]. The obtained partial sequences of PsaPOX and of the oxidase were used for a similarity search against public databases (NCBI BlastP).
