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Periodical. Zhang, Haiyu, Kazuya Ishige, and Arthur Kornberg. "A Polyphosphate Kinase (PPK2) Widely Conserved in Bacteria." Proceedings of the National Academy of Sciences of the United States of America 99, 26 (24 December 2002): 16678-16683. Article. 6 Images.. Proceedings of the National Academy of Sciences of the United States of America