Fig. 2

Phylogenetic tree, gene structures and protein motifs of 67 PtAPs. a The phylogenetic tree. Full-length protein sequences were aligned with Clustal X 2.0, and the phylogenetic tree was constructed using the neighbor-joining method. b Gene structure. Orange boxes represent exons, and black lines represent introns. The untranslated regions (UTRs) are indicated by blue boxes. The sizes of the exons and introns can be estimated using the scale at the bottom. c Protein motifs. Conserved motifs (1–20) are represented by different colored boxes while nonconserved sequences are shown by gray lines