The Roles and Evolutionary Patterns of Intronless Genes in Deuterostomes

Figure 4

Distribution of intronless genes specific to different taxonomic group combinations for each species. su: sea urchin; sq: sea squirt; z: zebrafish; c: chicken; p: platypus; h: human. A: archaea; B: bacteria; E: eukaryote; AB: archaea and bacteria; AE: archaea and eukaryote; BE: bacteria and eukaryote; ABE: archaea, bacteria and eukaryote; ORFans: homologs not found in other organisms.