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Welkos SL, Vietri NJ, Gibbs PH (May 1993). "Non-toxigenic derivatives of the Ames strain of Bacillus anthracis are fully virulent for mice: role of plasmid pX02 and chromosome in strain-dependent virulence". Microbial Pathogenesis. 14 (5): 381–8. doi:10.1006/mpat.1993.1037. PMID8366815.