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Yang FJ, Cheng LL, Zhang L, Dai WJ, Liu Z, Yao N, Xie ZP, Staehelin C.Yang FJ, et al. Among authors: staehelin c.J Bacteriol. 2009 Feb;191(3):735-46. doi: 10.1128/JB.01404-08. Epub 2008 Dec 5.J Bacteriol. 2009.PMID: 19060155Free PMC article.Retracted.