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A cogent question is, how might it be marketed with so little likelihood of being patentable, being a natural product

22 , 23 In a series of publications, the Truscott laboratory has identified a number of kynurenines and derivatives that are present in the human lens, they have described the pathways whereby these compounds are produced, and they have shown that these UV filters absorb ultraviolet radiation that otherwise could have detrimental photochemical effects on the lens and retina

Conflict of Interest The authors declare no competing interests

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