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. 2020 Jul 17;11:1659. doi: 10.3389/fmicb.2020.01659

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Copyright © 2020 Qiao, Wang 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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Effects of light intensity on the tested cyanobacterial strains at different time points. (A) The intracellular ROS levels in the three tested strains under high light. (B) The ratio of Fv/Fm in the three tested strains under high light. (C) The ratio of Fv/Fm in the three tested strains under normal light. Error bars indicate the standard deviation from triplicate analyses. Asterisks indicate significant differences (Student’s t test, P < 0.05) between the data of QY4 and QY7 strain. There was no significant difference between the data of Syn6803 and QY7 strain.