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. Author manuscript; available in PMC: 2006 Jan 6.
Published in final edited form as: J Am Chem Soc. 2003 Mar 5;125(9):2817–2826. doi: 10.1021/ja0211508

Figure 6.

Figure 6

Electrospray ionization mass spectra of cytochrome c that has been reacted with cross-linking reagents. The spectra are tuned with interface conditions optimizing the (a) monomer signal and (b) dimer signal. The absence of dimer ions in (a) indicates intramolecular cross-linking rather than cross-linking between monomer species.