Eyes differ in colour of the iris, which can be brown, green, blue or other colours. A connection between the HERC2 gene and eye colour has been established. This gene influences the expression of the OCA2 gene, which is involved in creation of the P protein. This protein is important for normal pigmentation and most likely plays a part in production of melanin. The amount of melanin influences the colour of our eyes. The more melanin is present in the iris, the darker the iris.
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