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. 2020 Jun 3;8:424. doi: 10.3389/fchem.2020.00424

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Copyright © 2020 Younis, He, Lin and Huang.

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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(A) Visible light, confocal microscopic (CLSM) images of superparamagnetic GQDs (MGQDs) labeled (i) and unlabeled (ii) 3T3 cells. (B) magnetomotive optical coherence tomography (OCT) images of MGQDs labeled (i) and unlabeled (ii) 3T3 cells; reproduced from Li et al. (2019) with permission from Wiley. (C,D) Concentration-dependent enhanced near-infrared (NIR) fluorescence as well as photoacoustic imaging (PAI) signal. (E) In Vitro PAI intensity of FA-N-GQDs and N-GQDs in both HeLa cells and A549 cells, respectively; reproduced from Xuan et al. (2018) with permission from IOP Publishing. **means P value is 0.05.