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Candidate precolibactin molecules synthetized by the pks biosynthetic pathway. Cleavage product released by the ClbP peptidase (1) and precolibactins molecules (2 and 3) that were elucidated in clbP mutants, based on mass spectrometry and nuclear magnetic resonance data. The electrophilic warhead, putative DNA intercalating motif, and the peptidase cleavage site are shown.
