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Pierce SE, Bell RL, Hellberg RS, Cheng CM, Chen KS, Williams-Hill DM, Martin WB, Allard MW.Pierce SE, et al. Among authors: hellberg rs.Appl Environ Microbiol. 2012 Dec;78(23):8403-11. doi: 10.1128/AEM.02272-12. Epub 2012 Sep 21.Appl Environ Microbiol. 2012.PMID: 23001674Free PMC article.