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Here , we identify transcriptional modules composed of the basic helix - loop - helix and bZIP transcription factors PHYTOCHROME - INTERACTING FACTOR1 ( PIF1 ) , PIF3 , ELONGATED HYPOCOTYL5 ( HY5 ) , and HY5 HOMOLOGY ( HYH ) that bridge light and ROS signaling to regulate cell death and photooxidative response .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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