Figure 5: ESI MS/MS spectra of transamidated peptide (60-106)T(116-123) bCN (MH+ 6141.30) (panel b) and native peptide (60-106) βCN (MH+ 5188.80) (panel a). The signals of the fifth charged parent ions were selected for CID (MH+5 1229.06 Da, panel a; MH+5 1038.56, panel b).