New Insights into Ligand-Receptor Pairing and Coevolution of Relaxin Family Peptides and Their Receptors in Teleosts

Figure 6

The proportion of sites in ligand and receptor genes subjected to different kinds of selection in teleosts. Selection types: purifying (light purple), neutral (dark purple), and positive (yellow). Hypothesized ligand-receptor pairs are placed in consecutive order. *Only present in zebrafish.