spxA2, encoding a regulator of stress resistance in Bacillus anthracis, is controlled by SaiR, a new member of the Rrf2 protein family.
Nakano MM, Kominos-Marvell W, Sane B, Nader YM, Barendt SM, Jones MB, Zuber P. Mol Microbiol. 2014 Nov; 94(4):815-27. Epub 2014 Oct 16.