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Less well-defined is the definition of a "dark" individual, versus a "light-skinned" individual, but that concept is useful as well, in regard to predicting skin cancer.
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Yes, but I don't see that this has anything helpful to say about "race". There are dark skinned lineages on every continent.
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I asked my friend, a former tissue-typer at a human organ transplant facility, about this. He said that you could call it arbitrary, but that they had very well-defined guidelines for what is commonly called a "good match."
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Same response. I don't see what this has to do with "race" as it is usually applied to human populations. There's no such thing eg. as a Hispanic kidney.