Figure 3From: Comparative genomics of archaea: how much have we learned in six years, and what's next?The most parsimonious scenario for the evolution of the main lineages of life. The red numbers in ovals near the internal nodes show the size of the reconstructed gene sets of the respective ancestral forms. Green numbers show gene gains and brown numbers gene losses assigned to each of the branches in the tree. LUCA, last universal common ancestor.Back to article page