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. 2019 Jun 20;7:e7133. doi: 10.7717/peerj.7133

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© 2019 Zhou et al.

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.

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(TS) different tissues, (SG) developmental stage seedlings, (ST) stress-treated seedlings, and (TT) data from all experimental groups combined. The average pairwise variations V_n/V_n+1 were analyzed between the normalization factors NF_n and NF_n+1 to indicate the optimal number of reference genes in different samples.