Fig. 1
From: New genes drive the evolution of gene interaction networks in the human and mouse genomes
Schematic diagram to show the network integration of new genes originating from various phylogenetic branches towards human. a Phylogenetic tree of vertebrates towards human together with branches and divergence times in millions of years from present (myr). The number of genes originating at each phylogenetic branches was also listed. b A sub-graph of human PPI network to show the incorporation of new genes from different originating times