Shown for each protein is the percent identity of the zinc ribbon (A), linker (B), and cyclin folds (C) for the list proteins relative to the three major A.thaliana TFB representatives that include AtTFIIB1 (red circle), AtBrf1 (blue square), and AtMEE12 (green triangle). For each protein, the percent identity is plotted on the horizontal line following the protein name. The gray dashed line indicates the 25% threshold. (D) Schematic of the AtBrp family proteins. Domains are colored according to the AtTFB representative they share highest sequence identity above the 25% threshold.