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Hair Colour
The dark pigment in skin and hair is called melanin which is made in melanocytes; these are activated by the melanocyte-stimulating
hormone (MSH).There are receptors for MSH on the surface of melanocyte cells. People with more receptors have darker skin and hair.

UV light increases the amount of…

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Many studies have supported the very complex interaction between childhood environment and the MAOA genotype.


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