Fig. 2From: Identification and evolution of C4 photosynthetic pathway genes in plantsPhylogenetic tree established for the NADP-ME gene family in 25 species (B branch). The B branch was further diverged into subfamilies B1 and B2. For the branch model, b1-b5 were assigned as front branches in the selective pressure analysis. C4 plants are marked with green circlesBack to article page