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sense femtomolar changes in the zinc level. In environmental and pathogenic mycobacteria zinc starvation induces expression of common zinc import systems such as the ZnuABC transporter, but also of other additional not yet characterized transport systems. In this study, we characterized the role of such systems in zinc transport. We showed that transport systems of both species whose transcription is induced upon zinc starvation can exchangeably restore cellular zinc homeostasis in transporter deficient mutants by transporting zinc into