The Roles and Evolutionary Patterns of Intronless Genes in Deuterostomes

Figure 3

Distribution of intronless genes among different kinds of gene ontology (GO) categories in each species. su: sea urchin; sq: sea squirt; z: zebrafish; c: chicken; p: platypus; h: human. ST: signal transducer; R: receptor; H: hormone; SP: structural protein; T: transporter; IC: ion channel; VGIC: voltage-gated ion channel; CC: cation channel; TR: transcription; TRR: transcription regulation; SR: stress response; IR: immune response; GF: growth factor; MIT: metal ions transport.