Single gene tree support projected on three concatenated prokaruyotic trees of different taxonomic depth levels. All trees based on the concatenation of 48 universal genes. Nodes in concatenated trees were compared with nodes present in the underlying single gene trees. Each node and their outgoing branches were colored according to presence of this node within single gene trees, from 0 to all 48 single gene trees. The trees include A) a prokaryotic dataset including 100 archaebacteria and eubacteria, B) 100 proteobacteria, C) 100 gammaproteobacteria species. Exact species names are given in Additional files 1, 2 and 3.