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. 2014 Dec 19;19(12):21411–21423. doi: 10.3390/molecules191221411

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© 2014 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).

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Effects of PD on cell growth inhibition of U251. U251 cells were treated with 0, 16.3, 40.8, 81.6 and 163.2 μM of PD for 24, 48, 72 and 96 h. Cell growth inhibition was measured by using MTT assay. Each value is presented as mean ± SD (n = 3). * p < 0.05 compared with 0 μM PD; ** p < 0.01 compared with 0 μM PD.