1888.txt 247 Bytes Raw Blame History Permalink 1 2 StpA repressed ompS1 expression in a mutant hns background H-NS negatively regulates ompS1 expression in both S. Typhimurium . StpA repressed ompS1 expression in a mutant hns background H-NS negatively regulates ompS1 expression in both S. Typhi .