Fig. 3From: Genome-wide characterization, evolution, structure, and expression analysis of the F-box genes in CaenorhabditisEvolutionary change of the number of F-box genes in the six nematode species. The numbers in circles and rectangles represent the numbers of genes in extant and ancestral species, respectively. The numbers with plus and minus signs indicate the numbers of genes gains and losses, respectively, for each branchBack to article page