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. 2017 Sep 21;12(9):e0185288. doi: 10.1371/journal.pone.0185288

Fig 3. Determination of the optimal number of reference genes.

Fig 3

The pairwise variation (Vn/Vn+1) was calculated between the normalization factors NFn and NFn+1 by geNorm. If the Vn/Vn+1 value is less than 0.15, there is no need to add an additional gene for normalization.