The MS/MS spectra of the of the precursor ion detected at m/z=1222.56, 3+ were assigned by pLink2 software to a type 2 peptide [ 70 A-K 87 ]-( 1 Z-K 16 ) with the hydrolyzed thiosuccinimide linker when fragmented by CID (Figure ) and by HCD (Figure ) were used. 1 Z means an N-terminal acetylated Cysteine residue in Cys 1 pP0 peptide.