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MS/MS spectra of d-Ala-l-Cys formed by DltA in the positive (P) and negative (N) ion modes. The structural formula shows d-Ala-l-Cys. The theoretical m/z values of the fragments are provided with the structure. The fragment ion at m/z 113 (negative ion mode) suggests that the product is not S-(d-alanyl)-l-cysteine but d-Ala-l-Cys. CE, collision energy.
