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. 2021 Feb 15;9:631909. doi: 10.3389/fchem.2021.631909

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Copyright © 2021 Wang, Wei and Zhao.

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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Fluorescent measurement of three parallel NiCo riboswtich sensors with concentration gradient: (A) FI/OD values were detected by 0–1,500 μM CoCl₂ for 2 h. (B) FI/OD values were detected by 0–1,500 μM CoCl₂ for 4 h. (C) FI/OD values were detected by 0–2,500 μM NiCl₂ for 2 h. (D) FI/OD values were detected by 0–2,500 μM NiCl₂ for 4 h.