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Sigma factors in a thousand E. coli genomes.
Cook H, Ussery DW. Cook H, et al. Environ Microbiol. 2013 Dec;15(12):3121-9. doi: 10.1111/1462-2920.12236. Epub 2013 Aug 29. Environ Microbiol. 2013. PMID: 23992563