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The artificial isomeric 9- cis form of retinal has been investigated within the chromophore binding pocket of rhodopsin by x-ray crystallography and quantum-mechanics with particular emphasis on the geometry imposed on the chromophore by the protein. Comparison with the native 11 -cis -rhodopsin structure reveals similarities and differences providing valuable insights into the photophysical properties of the visual pigment.
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Sekharan et al. (2007) studied this question.
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