Figure 1

Phylogenetic relationships among land plant GSK3 genes. Four major groups (I - IV) and four major gene duplication events (A1 - A4) are recognized. Numbers above branches indicate bootstrap support values (%). Gene lineages composed of angiosperms, gymnosperms, monilophytes, lycophytes, liverworts, mosses, and algae are labeled. Color bars to the right demarcate gene lineages that originated in the ancestors of extant tracheophytes (red), euphyllophytes (purple), and seed plants (green).