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Arif M, Fletcher J, Marek SM, Melcher U, Ochoa-Corona FM.Arif M, et al.Appl Environ Microbiol. 2013 Apr;79(7):2312-20. doi: 10.1128/AEM.03239-12. Epub 2013 Jan 25.Appl Environ Microbiol. 2013.PMID: 23354717Free PMC article.