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. 2020 Aug 24;21(17):6080. doi: 10.3390/ijms21176080

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Reaction of dopaquinone with cysteine. 5-S-Cysteinyldopa (5SCD) is the major isomer [26] and serves as a biochemical marker of malignant melanoma [28].