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. 2021 Jul 20;12:707784. doi: 10.3389/fimmu.2021.707784

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Copyright © 2021 Li, Yuan, Jiao, Huang, Li, Li, Ji and Wang

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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M1NVs treatment did not induce cell apoptosis and did not injury the organs. (A) The apoptosis percentage of macrophages treated with different concentration of M1NVs. (B) The apoptosis percentage of ESCs treated with different concentration of M1NVs. (C) The apoptosis percentage of HUVECs treated with different concentration of M1NVs. ns, No significance when compared with the group treated with 0 μg/mL M1NVs. *P<0.05, **P<0.01, ****P<0.0001 when compared with group treated with 0 μg/mL M1NVs. (D) IVIS of the organs from different groups. Group EM was the negative control since no labeled NVs were injected. (E) FCM showed NVs labeled with PKH67 were engulfed by the peritoneal macrophages. (F) H&E staining sections of organs from control group and EM-M1NV group (Scale bar = 100 μm).