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. 2017 Sep 19;7:11892. doi: 10.1038/s41598-017-10356-4

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© The Author(s) 2017

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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Structural representation of natural cryptochrome and artificial dyad F10T. (a,b) Migratory bird’s magnetic sense is based on the protein cryptochrome [PDB entry 1U3D]⁴, found in the retina. (c) Relative positions of the FAD cofactor and the Trp-triad (TrpA, TrpB and TrpC) of Arabidopsis thaliana cryptochrome. The FAD cofactor is colored in orange and the tryptophans are shown in blue. (d) Flavin-tryptophan dyad F10T consisting of a flavin residue (orange) and a tryptophan (blue) connected by an aliphatic linker (black).