The Sinorhizobium meliloti fur gene regulates, with dependence on Mn(II), transcription of the sitABCD operon, encoding a metal-type transporter Chao, Tzu-Chiao Chao Tzu-Chiao Becker, Anke Becker Anke Buhrmester, Jens Buhrmester Jens Pühler, Alfred Pühler Alfred Weidner, Stefan Weidner Stefan 186 11 3609-3620 3609-3620 AMER SOC MICROBIOLOGY 2004 1