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. 2013 Oct 4;8(10):e75271. doi: 10.1371/journal.pone.0075271

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© 2013 Ma et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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The pairwise variation(V) to determine the optimal number of reference gene for accurate normalization in all samples (A), NaCl-treated (B), PEG-treated (C), Dark-treated (D), Virus-treated (E). It is the representative of the V2/3, V3/4, V4/5, V5/6, V6/7, V7/8, V8/9 form one to seven.