Abstract
IT has been suggested recently1 that 5 : 6: 5â:6â-tetrahydroxy-indigo (I), or a quinone or semi-quinone derived from it, is an important constituent of melanin, the black pigment produced by the oxidation of tyrosine and 3 : 4-dihydroxyphenylalanine2.
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References
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HARLEY-MASON, J. Constitution of Melanin. Nature 159, 338–339 (1947). https://doi.org/10.1038/159338b0
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DOI: https://doi.org/10.1038/159338b0
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