Fig. 6From: Genomic sequence analyses of classical and non-classical lamprey progesterone receptor genes and the inference of homologous gene evolution in metazoansMembers of mPR and MAPR gene families in different taxonomic units of Metazoa. A schematic phylogenetic tree showed the relationships among major taxonomic units of Metazoa. The mPR and MAPR members presented in a taxonomic unit is indicated in colored boxesBack to article page