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Conform cercetarilor conduse de profesorul danez Hans Einberg, toti oamenii au prezentat inca de la inceputuri, culoarea caprui a irisului. Momentul de cotitura s-a produs acum 6.000 -10.000 de ani cand o gena denumita OCA2, a dus la diversificarea culorii ochilor tuturor tipurilor de oameni. S-a demonstrat ca mutatia din cadrul genei OCA2, afecteaza producerea de melatonina, un pigment biologic responsabil de culoarea pielii, a ochilor, parului si unghiilor. Conform ipotezelor profesorului Eiberg, mutatia preistorica a dus la scaderea nivelului melatoninei, ceea ce a dus mai departe la colorarea in nuante de albastru, verde si negru. Studii echipei profesorului Eiberg, indica faptul ca primii oameni cu ochi albastri sau verzi au aparut in teritoriul situat astazi in nordul Afganistanului.
Sursa: Daily Galaxy
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