>Regarding hypos augmenting red, I disagree.

Then what causes the color difference between albinos and sunglows? Both lack all melanin.

As for the difference between red and yellow pigment, one possible answer is that they are the same pigment. The yellow pigment cells might have fewer pigment granules or smaller pigment granules than the red pigment cells. Or the yellow pigment cells might be fewer per unit area of skin than the red pigment cells. This is not the only possible answer, but it is worth thinking about.

Paul Hollander

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