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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) Influence of polyethylene glycol (PEG) chains on the longitudinal relaxivity. (B) In Vivo T₁-weighted MR images of A549 tumor-bearing mice before and after injection of hyaluronic acid-targeted PGQD (PGQD-HA); reproduced from Yang et al. (2019) with permission from the American Chemical Society. (C) In Vivo T₁-weighted MR images of mice before and after i.v. injection of B-GQDs; reproduced from Wang et al. (2017) with permission from Wiley. The arrows represented different organs: heart (H), kidney (K), stomach (St), and spleen (Sp).