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. 2020 Sep 11;11:4569. doi: 10.1038/s41467-020-18393-w

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — a Absorption spectrum (black curve) of an aqueous solution of DOPA melanin. Profiles of excitation laser pulses (colored curves) used in femtosecond transient absorption measurements showing their spectral width (arbitrary vertical scaling). b Transient spectral holes extracted from transient absorption spectra measured 500 fs after excitation at 400, 500, or 600 nm. c Chemical structures of eumelanin building blocks. d Dimers of the building blocks, showing two major types of redox forms. e A few substructures proposed for DOPA melanin and other eumelanins. Labels indicate redox forms, which vary from least to most oxidized in the order hydroquinone<semiquinone<quinone imine/methide<quinone.