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. 2017 Feb 23;7:43370. doi: 10.1038/srep43370

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Enzymes are indicated in red. In this representation, black melanin is considered as Dopamine-melanin (see text for experimental justification) and the alternative pathway mentioned by several authors leading to Dopa-melanin is represented in grey. NβAD: N-β-Alanine-Dopamine.