FOS and Crohn disease: Moreover, the Enterobacteriaceae bacterium 9_2_54FAA strain, isolated from inflamed biopsy tissue from a patient with Crohn's disease [Enterobacteriaceae bacterium 9_2_54FAA Sequencing Project, Broad Institute of Harvard and MIT (http://www.broadinstitute.org/)], possesses a truncated locus similar to the fos locus with a transcriptional regulator (73% identity with FosR), an MFS transporter (89% identity with FosT), a glycosyl-hydrolase (67% identity with FosE1), a protein of unknown function, and a fructokinase (66% identity with FosK).