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. 2016 Aug 19;7:305. doi: 10.3389/fimmu.2016.00305

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Copyright © 2016 Song, Chen, Jiang, Yang, Li, Zhao, Ouyang, Fan and Yuan.

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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Histological examination. (A) Safranin O/fast green staining (red: cartilage, gray green: cytoplasm). (B) anti-TNF-α staining (brown: TNF-α) of 4 experimental group (PDAPEI/pDNA, PEI 25 kDa/pDNA, PEI 1.8 kDa/pDNA and saline control group) and normal knee joint. Scale bar = 100 μm.

Histological examination. (A) Safranin O/fast green staining (red: cartilage, gray green: cytoplasm). (B) anti-TNF-α staining (brown: TNF-α) of 4 experimental group (PDAPEI/pDNA, PEI 25 kDa/pDNA, PEI 1.8 kDa/pDNA and saline control group) and normal knee joint. Scale bar = 100 μm.