Phylogenetic tree of GST gene family. Neighbor-joining-based phylogenetic tree of GST protein sequences. Including several kinds of typical vertebrates: human (Hs), chicken (Gg), frog (Xt), zebrafish (Dr), pufferfish (Tr), medaka (Ol), stickleback (Ga) and common carp (Cc). GST superfamily is labeled by three subfamilies: cytosolic GST, mitochondrial GST and MAPEG.