Fig. 3

Analysis of StPUBs from the perspectives of phylogenetic relations, gene structures, and conserved motifs. A StPUBs phylogenetic tree. Boxes of different colors represent eight subclasses of StPUBs, the red box represents the C1 subclass, the yellow box represents the C2 subclass, the green box represents the C3 subclass, the blue box represents the C4 subclass, the purple box represents the C5 subclass, the light pink box represents the C6 subclass, the light blue box represents the C7 subclass, and the khaki box represents the C8 subclass, respectively. B StPUB genes’ intron/exon organization. The black line with an identical length and the blue box indicates the intron and exon, respectively, whereas the red box indicates the upstream/downstream area. Specifically, 0, 1, and 2 stand for the intron splicing phase. C Conserved motif distributions within StPUBs. MEME program was employed for predicting candidate motifs. Those 20 boxes with diverse colors stand for 20 different putative motifs. Supplementary Table 2 presents detailed information on 20 candidate motifs