The phylogeny of 54 Actinopterygii CYP3 family genes and nine outgroup CYP3 genes from other species were constructed using MrBayes. Numbers at nodes are posterior probabilities from Bayesian inference. Dre (Danio rerio), Ppr (Pimephales promelas), Gra (Gobiocypris rarus), Ssa (Salmo salar), Omy (Oncorhynchus mykiss), Fhe (Fundulus heteroclitus), Ola (Oryzias latipes), Msa (Micropterus salmoides), Dla (Dicentrarchus labrax), Fru (Fugu rubripes), Tni (Tetraodon nigroviridis), Gac (Gasterosteus aculeatus), Ipu (Ictalurus punctatus), Oni (Oreochromis niloticus), Gmo (Gadus morhua), Ifu (Ictalurus furcatus), Sau (Sparus aurata), Omo (Osmerus mordax), Afi (Anoplopoma fimbri), Hhi (Hippoglossus hippoglossus), Aan (Anguilla Anguilla), Sac (Squalus acanthias), Ler (Leucoraja erinacea), Pma (Petromyzon marinus), Has (Homo sapiens), Mmu (Mus musculus), Bfl (Branchiostoma floridae).