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. 2019 Apr 26;7:88. doi: 10.3389/fbioe.2019.00088

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Copyright © 2019 Pei and Wei.

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.

PMC Copyright notice

Diagrams of two fluorescence intensity-based USF imaging systems, reported by two different research groups: (A) Yuan et al., 2012; Pei et al., 2014; and (B) Lin et al., 2012a. Reproduced with permission. Copyrights 2012 API Publish and 2014^©Springer Nature.