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A working model illustrating that phyA and FHY1 can either uniquely or coordinately associate with gene promoters. Overall, transcription factors binding to diverse cis-elements exhibit different affinity with phyA or FHY1, thus leading to the distinct association patterns of phyA and FHY1 on the promoters. The numbers (i–vii) correspond to different cis-element categories labeled in Fig. 5C. X and Y, unknown factors that are involved in the unique associations.
