Nature Reviews Microbiology 7, 25–35 (2009), doi: 10.1038/nrmicro2057

In the above article, the term MgtE was incorrectly added. On page 28, the following sentence is incorrect: When the magnesium concentration is sufficient, MgtE binds to this ribonucleotide sequence, thereby exposing a terminator structure that halts transcription in the leader region. The sentence should read: When the magnesium concentration is sufficient, magnesium binds to this ribonucleotide sequence, thereby exposing a terminator structure that halts transcription in the leader region.

We apologize to the authors, and to readers, for any confusion caused.