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. 2017 Apr 4;8:182. doi: 10.3389/fphar.2017.00182

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Copyright © 2017 Lin, Chen, Zou, Wang, Wang, Li, Huang, Fu, Zhao, Lin, Xu and Yong.

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) or licensor 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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Cytotoxicity tests of QD-PEI formulation by MTS assays. (A) U251 cells and (B) U87 cells were treated with different concentrations of QD-PEI formulation for 24 or 48 h. Values are means ± SD, n = 5.