Figure 3: Phylogenetic tree of silkworm BTB protein genes. A neighbor-joining phylogenetic tree of the identified silkworm BTB protein genes was constructed using the ClustalX program and visualized using the MEGA4 software. (a) BTB domain sequence-based phylogenetic tree. (b) Complete amino acid sequence-based phylogenetic tree. Similar grouping clades between these two phylogenetic trees are indicated by the same colors.