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Periodical. Kim, Kwang-Seo, Narayana N. Rao, Cresson D. Fraley, and Arthur Kornberg. "Inorganic Polyphosphate is Essential for Long-Term Survival and Virulence Factors in Shigella and Salmonella spp.." Proceedings of the National Academy of Sciences of the United States of America 99, 11 (28 May 2002): 7675-7680. Article. 6 Images.. Proceedings of the National Academy of Sciences of the United States of America