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Simplified Model Describing Putative Phytochrome Signal Transduction Pathways Reaching the Lhcb1*2 Promoter.
Sustained activation of phyA initiates a signaling cascade (solid lines) that partially deviates from the transduction chains initiated either by transient excitation of phyA (dotted line) or by phyB (dashed line). X represents an unidentified factor binding the promoter region specifically necessary for HIR.
