Citation: M. Skurnik et al., Characterization of the O-antigen gene clusters of Yersinia pseudotuberculosis and the cryptic O-antigen gene cluster of Yersinia pestis shows that the plague bacillus is most closely related to and has evolved from Y-pseudotuberculosis serotype O : 1b, MOL MICROB, 37(2), 2000, pp. 316-330