Bacterial phylogeny, and the distribution of 20 million orthogenomic signatures across this phylogeny. ( a) Our computed RNA polymerase based phylogeny, showing the deep branches between bacterial phyla, and ( b) The distribution of signature peptides across the nodes of this phylogeny, with branch-length information removed. The symbol area at each node represents the fraction of total number of signatures assigned to the node. The root node, with 11% of the signatures, is shown in red. Most phyla are labeled and can be used together with the complete tree (Additional file 2, Additional file 3) to identify which taxa are covered by each node.