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Allan E, Clayton CL, McLaren A, Wallace DM, Wren BW.Allan E, et al. Among authors: clayton cl.Microbiology (Reading). 2001 Aug;147(Pt 8):2285-2292. doi: 10.1099/00221287-147-8-2285.Microbiology (Reading). 2001.PMID: 11496005Free article.