Phylogenetic comparison of IDD amino acid sequences from several plant species. Mid-point rooted phylogram based on amino acid sequences for the same region used in Figure 7. IDD genes found in maize (red), rice (blue) and Arabidopsis (black), as well as PCP1 from potato (Solanum tuberosum; green) and a potential ortholog of ID1 from Sorghum bicolor, SbID (purple), with Bayesian posterior probability values above 80% indicated above the branches. Circles of the same colour and labeled with the same letter on both trees highlight differences between the two sets of analyses; in particular, circled groups indicate amino acid groupings between Arabidopsis and grasses that were not apparent in genomic DNA analyses. Sequences enclosed by rectangles labeled 'D' form a less-well supported Arabidopsis-grass amino acid assemblage.