Figure 1. (continued) (a) A schematic representation of the metazoan family tree, showing the potential branching points of the last common ancestors between each phylum. (b) The six subfamilies of the nuclear receptor (NR) superfamily. A consensus phylogenetic tree demostrating the distribution of representative nuclear receptor members in the Metazoa and their distribution into six subfamilies. This figure uses the trivial names of the NRs. For a complete list of the corresponding new nomenclature see Nuclear Receptors Committee 1999 or the Nuclear Receptor Nomenclature Home page. This phylogenetic tree was constructed using the ClustalX program v2.0 with the near-neighbour joining method. From top to bottom the accession numbers are: XP_779976, P13631, BAA25569, NP_001071806, NP_001123279, AAF57280, XP_001636937, NP_775180, CAA61534, AAL29199, XP_001619117, XP_001634258, XP_001632045, AAL29194, ACF16007, ABI97120, BAE06416, P11474, AAU88062, NP_001135406, XP_002117374, XP_001636637, XP_002117375, XP_001624292, NP_001122483, XP_001631058, AAL29201, AAL29196, XP_002109806, XP_002159396, BAE06356, AAF54774, XP_001944021, XP_001629708, AAL29200, AAF57091, XP_002154441, XP_001624815, XP_001634999, AAF52303, XP_780706, ACG76360, XP_001630385, AAP79295, XP_001630386, AAL29193, AAC80008, NP_476781, BAE06678, XP_002109459, BAF85823, AAW34268, NP_001097126, BAE06492, XP_001638550, XP_002159483, CAA61134, XP_002115810, ACA04755, CAD57002, NP_730359, ACH68437, XP_001179003, BAE06474, NP_001024953, CAA06670.