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. 2016 Dec 22;91(6):2425–2441. doi: 10.1007/s00204-016-1907-4

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© The Author(s) 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 2 — Measurements of pH_e and pH_i (mean ± SEM, n = 4 for pH_e and n = 8 for pH_i). a, b Changes in extracellular pH_e in A549 and BEAS-2B cell culture medium (with and without cells) after 6, 24 and 48 h (w/o = without), respectively; c, d changes in intracellular pH_i in A549 and BEAS-2B cells after 6, 24 and 48 h, respectively; e, f correlation between pH_e and pH_i in A549 and BEAS-2B cells, respectively