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Photoreceptor proteins discussed in this perspective article. (A) Photoactive Yellow Protein with p-coumaric acid as a chromophore; (B) Rhodopsin with a retinal chromophore; (C) Green Fluorescent Protein with a HBDI chromophore; (D) Cyanobacteriochrome with phycocyanobilin as a chromophore; (E) Phytochrome with a Biliverdin chromophore.
