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Siderophores of mycobacterial species. (A) Structure of the major MB of M. tuberculosis (MB T). (B) Structure of the major exochelin of M. smegmatis (exochelin MS). Peptidic siderophores such as exochelin MS have only been identified from fast-growing saprophytic strains, while MBs such as that shown in panel A have been found widely distributed among mycobacterial species.
