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Retinal
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==History== The American biochemist [[George Wald]] and others had outlined the visual cycle by 1958. For his work, Wald won a share of the 1967 [[Nobel Prize in Physiology or Medicine]] with [[Haldan Keffer Hartline]] and [[Ragnar Granit]].<ref>[https://www.nobelprize.org/prizes/medicine/1967/summary/ Nobel Prize in Physiology or Medicine 1967]</ref>
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