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Light is a key environmental signal for most life on earth. Over 5% of Neurospora crassa genes are expressed in response to light stimulation in a temporally regulated cascade that includes several transcription factors. Fungal genomes, including Neurospora's, may encode several different proteins capable of binding chromophores with the ability to harvest light energy as well as proteins that can interact with primary photoreceptors or further propogate the light signal. The best understood photo- receptors are the evolutionarily conserved White Collar proteins, and the related Vivid protein, but fungi may also encode phytochromes, cryptochromes and opsins.
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Chen et al. (2009) studied this question.
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