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. 2023 Nov 3;11:1291824. doi: 10.3389/fbioe.2023.1291824

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Copyright © 2023 Li, Li, Li, Wang, Tan and Li.

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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Optical properties of FAP-2286-ICG. (A) Absorbance spectra of FAP-2286-ICG and free ICG; (B) Fluorescence emission spectra of FAP-2286-ICG and free ICG; Visual (C) and quantitative (D) results of the relationship between FAP-2286-ICG concentration and relative fluorescence intensity in vitro; (E) Viability of U87MG cells incubated with different concentrations of FAP-2286-ICG for 48 h. Data were expressed as mean ± SD (n = 3).