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. Author manuscript; available in PMC: 2009 Sep 22.
Published in final edited form as: Rapid Commun Mass Spectrom. 2009 Jun;23(11):1719–1726. doi: 10.1002/rcm.4066

Figure 4.

Figure 4

Superposition of the FT-ICR MS spectra of a peptide from a digest of BCCL1 (dashed lines) and BCCL2 (solid lines) cross-linker treated CA. The monoisotopic mass increment (56.06257 Da) corresponds precisely to the mass difference between the two cross-linkers (C4H8, 56.06260 Da). Mass measurement errors are less than 1 ppm on the FT-ICR MS.