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(A) Structures of the retinal chromophores of ASRAT and ASR13C. (B) The intertwined photocycles of ASRAT and ASR13C as represented by the ─C12─C13═C14─C15═N─Cε─ chromophore moiety in the different states. The wavelength values refer to observed (17) and computed (in bold) absorption maxima of the full protein. In each state the isomerizing bond is highlighted.
