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MS/MS spectra of the tripeptides formed by DltA in the positive (P) and negative (N) ion modes. The structural formulae show the respective tripeptides: d-Ala-l-Cys-Gly (a); Gly-l-Cys-Gly (b); d-Ser-l-Cys-Gly (c); d-Cys-l-Cys-Gly (d); d-Thr-l-Cys-Gly (e); d-Val-l-Cys-Gly (f); l-Ala-l-Cys-Gly (g); l-Ser-l-Cys-Gly (h); and β-Ala-l-Cys-Gly (i). The theoretical m/z values of the fragments are given with these structures. CE, collision energy.
