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Under iron-starvation conditions, the different Yersinia species expressed various iron-regulated proteins. Among them, two high-molecular-weight outer membrane proteins were synthesized in high-virulencephenotype Y. pestis, Y. pseudotuberculosis, and Y. enterocolitica serovars 0:8 and O:Tacoma but were present neither in low-virulence phenotype Y. enterocolitica serovars 0:3 and 0:9 nor in avirulent Y. frederiksenii, Y. kristensenii, Y. intermedia, and Y. enterocolitica serovar 0:39. Thus, the degree of virulence correlates with the presence of the two high-molecular-weight proteins in Yersinia species.

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