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Phylogenetic analyses of 14 serovars of ureaplasmas. The nucleotide sequences including the V4 to V5 regions of the isolates were determined and then analyzed by the neighbor-joining method. The numbers at the nodes represent the percentage of 1,000 bootstrap pseudoreplicates that contained the cluster distal to the node. Fourteen serovars of ureaplasmas formed two distinct clusters, U. parvum (previously U. urealyticum biovar 1) and U. urealyticum (previously U. urealyticum biovar 2).
