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. 2018 Aug 1;4(8):eaar3302. doi: 10.1126/sciadv.aar3302

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Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.

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Fig. 1 — The scheme of light and dark reactions we explore, considering two steps along the path to forming pyrimidines (RNA precursors): one with bisulfite $({SO}_{3}^{2 -})$ as the electron donor and the other with hydrogen sulfide (H₂S and HS⁻) as the electron donor.