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. Author manuscript; available in PMC: 2013 Nov 20.
Published in final edited form as: Acc Chem Res. 2012 Mar 29;45(11):1896–1905. doi: 10.1021/ar3000025

Figure 1. The isotope dilution experiment.

Figure 1

(left) 100% labeled samples have one residue of the sequence fully labeled with 13C=18O. (right) Dilution results in 10% of peptides having one residue isotopically substituted. Nearby 13C=18O labels form excitons.