Fig. 4From: Cloning and expression of BpMYC4 and BpbHLH9 genes and the role of BpbHLH9 in triterpenoid synthesis in birchNeighbor-joining phylogenetic tree of BpbHLH9 from Betula platyphylla and other bHLHs constructed using the MEGA 6.0 software program. The scale bar represents 0.05 amino acid substitutions per siteBack to article page