Phylogenetic relationship between GPCRs in the Tetraodon and human genome. The position of the rhodopsin family was established by including fifty receptors randomly from the rhodopsin family. These branches were removed from the final figure and replaced by an arrow towards rhodopsin family analysis in Additional data file 2. Numbers in black refers to Tetraodon GPCRs as per number represented in Additional data file 1. Tnig-GPCRs with unusual lengths of the predicted 7TM domain (under predicted or over predicted TM helices; please see Methods for details), are marked using a '#' symbol.