Effect of missing data on branch support. The randomness of EST sequencing results in some partitions not being found for all taxa. This histogram shows the effect of missing taxa in process partitions on support for each node. Support decreases as less taxa are included in the analysis however, these results do not take into account the varied amount and distribution of data available for each taxon (see text). The shading of the bars indicates the node in the SA tree: black = node 1; darker gray = node 2; lighter gray = node 3 and white = node 4. Branch support is given on the Y-axis, and the number of taxa in a process partition are given in clusters on the X-axis.