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A working model depicting BBX30 and BBX31 in the regulation of photomorphogenesis. Light induces the accumulation of transcription factor HY5 and expression of BBX30 and BBX31. Accumulated HY5 directly binds to the G-boxes present in the promoters of BBX30 and BBX31, thereby inhibiting their expression. Both BBX30 and BBX31 negatively regulate photomorphogenic development.
