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Identification of the mature forms of ComS in the supernatant of a ComS-overproducing strain with impaired peptide import (TIL1329). (A) Features of peptides corresponding to fragments of the ComS precursor detected with an Orbitrap mass analyzer. (B) Fragmentation spectrum of the alkylated ion m/z 1,237.66 analyzed in a linear ion trap. The stars indicate the alkylation of the cysteine residue.
