DNase I footprints created by TF binding at different time points of flower development. CArG box motifs were identified by MEME-ChIP in the AP1 and SEP3 peak regions (full list of motifs identified by MEME-ChIP in Additional file 3: Figure S4C). Footprints for selected motifs are shown in the right part of the Figure. (A) CArG-box 1 produces footprints at similar frequency at every time point. (B) CArG-box 2, identified only in the SEP3 ChIP-seq data, shows an increased footprint frequency at day 8. (C) An example of GA-rich motif, which produces more frequently footprints at early time points of flower development.