Fig. 7: Validation of gm-AEJ=gm-AEJA and gm-AEJA=gm-AEJ mass coincidence.

A Predicted list of signature ions for gm-AEJ=gm-AEJA (3–4 cross-link) and gm-AEJA=gm-AEJ (3-3 cross-link). B MS data corresponding to 897.8918 m/z ion (top panel) and extracted ion chromatogram showing 3 peaks at consecutive retention times (bottom).