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Figure. Unrooted tree showing the phylogenetic relationships between
the sequence obtained from the YP3 spacer from Justinian sample 202 and
that from the genomes of Yersinia pestis strain CO92 (GenBank accession
no. AJ414159), Y. pestis biovar Medievalis (AE017139), Y. pestis
strain Kim (AE013993), and Y. pseudotuberculosis (BX936398). DNA
sequences were aligned by using the ClustalW software, version 1.81 (2).
Deletions were considered single events. A distance matrix was constructed
by using the Kimura-2 parameter, and the phylogenetic tree was inferred
by using the neighbor-joining method in the Mega2 software package. The
scale bar represents a 0.5% nucleotide sequence divergence. Bootstrap
values are indicated at the nodes (2).
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