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The blue colour is an example of structural colour, caused by light interacting physically with something. Some examples of structural colour are the iridescence of insect wings and body surfaces (usually caused by repeating chitinous structures), and of certain birds feathers, as well as the non-iridescent colours of the blue and yellow macaw. In the case ...


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The generation of iris color is quite complex and the exact color of the eyes depends upon many different factors, not just melanin. In fact, blue coloration does not depend on a specific chemical, but on the structure of the eye itself. This very nice review (free) summarizes our current understanding: Genetics of human iris colour and patterns - Sturm and ...


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The tanning response to UV occurs in two phases: The immediate response begins at exposure to UV-A, reaches a max at 1-2 hours, and fades between 3 and 24 hours. This article speculates that this is due to the redistribution of melanosomes rather than additional melanin production. The delayed response is more durable, occurring by repeated exposure to ...



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