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He S, Gall DL, McMahon KD.He S, et al.Appl Environ Microbiol. 2007 Sep;73(18):5865-74. doi: 10.1128/AEM.01207-07. Epub 2007 Aug 3.Appl Environ Microbiol. 2007.PMID: 17675445Free PMC article.