Figure 6.

Dipeptide formation. (A) Quadrupole enhancement of the region in which the 16⁺ peptides of ProCAT and 15⁺ peptides of PheATE are observed, where a 1:1 ratio of ProCAT to PheATE was incubated for 45 sec. The lines indicate where each species would be for the 16⁺ charge states. (B) Shows the same region with a 2:1 ProCAT to PheATE ratio after a 5-min incubation. (C) Broadband spectrum with an expansion of the spectral region containing 16⁺ charge states for ProCAT and 15⁺ for PheATE in the holo, Ala, and Phe-Ala forms (as indicated) after 15 min of incubation.