Figure 2.

Mechanisms of Arabidopsis PG family expansion. The locations of Arabidopsis PGs are indicated on the Arabidopsis chromosomes. The tandem clusters are also indicated. They are color-coded based on the following scheme: PGs found in both duplicated regions of a block pair (green); PGs found in only one duplicated region of a block pair (red); and no PG is located in these blocks (gray). PGs covered by AGI blocks are either red or green, while PGs covered by BHW but not AGI blocks are with white text and black-boxed background. If PGs are found in both duplicated regions of a block, the gene names are linked. In addition, these gene names are italicized if they belong to the same clade. PGs that are not found in either AGI or BHW blocks are shown in black text. Tandem duplications are indicated by cluster designation. BHW block names were modified from the original designations of Blanc et al. [20]. BHW block names with a prime indicate that they overlap with AGI blocks of the same names. The reference for the block names can be found in Additional data file 2.