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. 2019 Mar 21;10:551. doi: 10.3389/fmicb.2019.00551

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Copyright © 2019 Chi, Zhang, Sun, Duan, Qiao, Luan and Lu.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Growth assays of PCC7942-WT and PCC7942-XC1 under induction of gradually increasing theophylline concentrations. (A) No theophylline was added; (B) 110 μM theophylline was added; (C) 1100 μM theophylline was added. Optical densities under 730 nm (OD730) were used to calculate cell concentrations. The data utilized are averages of measurements from at least three independent biological repeats, and the standard deviations bars are shown.