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© Luxembourg Science Center – Jo Hoeser

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© Luxembourg Science Center – Jo Hoeser

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© Luxembourg Science Center – Jo Hoeser

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This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International license. https://commons.wikimedia.org/wiki/File:Photoreceptor_cell.jpg

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© Luxembourg Science Center – Jo Hoeser

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https://commons.wikimedia.org/wiki/File:Ishihara_11.PNG

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© Luxembourg Science Center – Jo Hoeser

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https://commons.wikimedia.org/wiki/File:All-trans-Retinol2.svg