Abundance and sequence diversity of miR168 members across plant families. (A) Highest abundance of miR168 among monocots. Color bars represent most abundant forms of miR168 in leaf tissues. Blue, red and green bars represent monocot, dicot and Solanaceae-specific forms as shown in Figure 1. Abundance was measured as discussed in methods section. (B) Percentage abundance of miR168 across plant families. Phylogenetic relationships among plant species have been indicated.