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. 2017 May 3;8:668. doi: 10.3389/fpls.2017.00668

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Copyright © 2017 Huang, Tan, Yu, Chen, Guo, Wang, Zhang, Chen, Zhang and Diao.

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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Pairwise variation (V) of 10 candidate reference genes calculated by geNorm to determine the optimal number of reference genes for accurate normalization. The threshold is 0.15.