Figure 2 From: Multiple, non-allelic, intein-coding sequences in eukaryotic RNA polymerase genes Phylogenetic distance tree of RNA polymerases. RNA polymerase sequences are taken from accession data as described in the Methods section. The unrooted tree was constructed by the neighbour-joining method using PAUP*4b10 [52] and the default settings. Numbers on the branches indicate the percentages of bootstrap support indicated by a heuristic search with 100 random addition replicates and the tree-bisection-reconnection branch-swapping algorithm. All bootstrap values > 50 have been reported except where they occur within the three well-supported RNA polymerase I (rpo1), RNA polymerase II (rpo2) and RNA polymerase III (rpo3) groups. RNA polymerases that contain an intein are indicated by asterisks (*); strains of the E. huxleyi virus are polymorphic for the presence of an intein in RNA polymerase (*/-). The alignment used is available as supplementary data (additional file 1).Back to article page