Figure 1

Summary tree indicating the distribution of ubiquilins in eukaryotes. This is the neighbor-joining (NJ) tree, but the maximum-parsimony (MP) and maximum-likelihood (ML) dendrograms were similar enough as to allow all the results to be drawn together. The tree is drawn to scale, with branch lengths in the same units as those of the evolutionary distances used to infer the phylogenetic tree. A scale bar is shown below the tree. The numbers in the branches indicate bootstrap supports (in percentages) for the three methods of phylogenetic reconstruction (as follows: NJ/MP/ML). For simplicity, only the most relevant boostrap values are indicated. In brackets, the number of sequences within each group. These groups were made by putting together all the sequences that belonged to related species, in order to deduce the minimum number of groups for each eukaryotic class. Thus, all plant can be put in a single group, animal sequences can be classified into two groups, etc. For alveolates, stramenopiles and excavates, the main phyla that can be found within each group are indicated (in parentheses). A more detailed view of this tree can be found in Additional file 2.