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Ferrell E, Carty NL, Colmer-Hamood JA, Hamood AN, West SEH.Ferrell E, et al.Microbiology (Reading). 2008 Feb;154(Pt 2):431-439. doi: 10.1099/mic.0.2007/011577-0.Microbiology (Reading). 2008.PMID: 18227247Free article.