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