Fig. 2From: Genome-wide investigation and expression profiling of polyphenol oxidase (PPO) family genes uncover likely functions in organ development and stress responses in Populus trichocarpaPhylogenetic, gene structure, conserved protein structure, and motif analyses of PtrPPOs. a Phylogenetic tree constructed using full-length amino acid sequences from 18 PtrPPOs. b Exon-intron structure analysis of PtrPPO genes. Blue boxes represent UTRs; yellow boxes indicate exons; black lines represent introns. c Motif distribution of PtrPPO members. d conserved protein domain analysis of PtrPPOs. The length of each pattern is displayed proportionallyBack to article page