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. 2012 Dec 21;7(12):e52308. doi: 10.1371/journal.pone.0052308

Figure 9. LC-MS/MS detection of the isopeptide crosslink, ε-(γ-glutamyl)-lysine.

Figure 9

The panels show tandem mass spectra at 1 to 2 minutes monitoring m/z = 276 for the ε-(γ-glutamyl)-lysine standard, for heat-treated, enzyme-digested honeybee silk sponge and for non-heat-treated, enzyme-digested honeybee silk.