Abstract
THE visual pigment rhodopsin (I) consists of the prosthetic group 11-cis-retinal covalently bound to phosphatidyl ethanolamine in a protonated Schiff base1,2. 
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References
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PATEL, D. Charge Delocalization in the Prosthetic Group of Visual Pigments. Nature 224, 799–800 (1969). https://doi.org/10.1038/224799a0
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DOI: https://doi.org/10.1038/224799a0
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