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. 2018 Jan 8;9:74. doi: 10.1038/s41467-017-02426-y

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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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Fig. 4 — Cellular modelling of HCO₃ ⁻ uptake. a–d Simulated changes in concentrations of inorganic carbon species and H⁺ at the cell surface relative to bulk solution concentrations. Three different scenarios were simulated: (1) Photosynthesis supported by HCO₃ ⁻ uptake with equimolar OH⁻ export, (2) HCO₃ ⁻ uptake only, (3) HCO₃ ⁻ uptake with OH⁻ export occurring at 20% the rate of HCO₃ ⁻ uptake, a scenario chosen to best match the H⁺ drawdown observed in the presence of AZ