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Lugenbiel P, Govorov K, Rahm AK, Wieder T, Gramlich D, Syren P, et al

light entering the eye passes through it undisturbed and is clearly focussed onto the retina

Free Radical Biol Med 45(10):13751383 Itoh K, Tong KI, Yamamoto M (2004) Molecular mechanism activating Nrf2Keap1 pathway in regulation of adaptive response to electrophiles

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Since it can be formed from these three amino acids in the body, it is deemed non-essential, in that it does not have to be obtained from food