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Why some women may see 100 million colors

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Arguing over paint swatches is an unwinnable biological war. Because the genes responsible for color vision are located on the X chromosome, a rare mutation allows some women to develop a fourth type of cone cell in their eyes. These 'tetrachromats' can distinguish up to 100 million colors, while the rest of us just see varying shades of boring.

Why some women may see 100 million colors
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