Figure 8From: Elucidating the evolutionary history and expression patterns of nucleoside phosphorylase paralogs (vegetative storage proteins) in Populusand the plant kingdomHypothetical origin of the NP-like gene family in Populus trichocarpa . Blue arrows represent whole genome duplication events and orange arrows represent tandem duplication events. Asterisks denote ancestral genes with unknown sequence similarity to present-day genes.Back to article page