Figure 1: (a) Phylogenetic trees for Arabidopsis thaliana and Glycine max. (b) Sketch map of collinear genes in blocks. A pair of horizontal lines which have the same color represent one collinear DNA fragment in one species. Horizontal lines with different colors represent collinear DNA fragment from different species in phylogenetics tree. Different genes denoted by rectangles have different colors, and the collinear homologous genes denoted by rectangles have the same colors. Rectangles surrounded by imaginary line represent the gene loss events. The blue curve shows the gene duplication, and the blue arrows indicate the gene insertion.