Phylogenetic distribution of ncRNA candidates. The tree only represents the topology and is not drawn to scale. Branch lengths are indicated below by large numbers in sans serif font, measured in terms of substitutions per site for 4-fold degenerated sites. For each branch we mark the number of RNAz hits for p > 0.5 and p > 0.9, respectively above the branch leading to the last common ancestor (LCA) of the sequences in the corresponding input alignment (full boxes). Below the branches we indicate the corresponding numbers for the "gentle" control screen. Below the tree the ratio of the fraction of newly appearing RNAz hits and the branch length is given, indicating little variation in the "innovation rate". Since the original tree is unrooted without an outgroup, no data are available for the branch separating Sophophora from the rest. The number of RNAz hits listed in the tree is smaller than the total number of RNAz hits because we only considered sequences present in all single windows of an RNAz hit here.