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Pairwise variation Vn/n+1 between the normalizing factors NFn and NFn+1The variation Vn/n+1 between NFn and NFn+1 was calculated with geNorm to determine the optimal number of reference genes that should be used for normalization. The empirical cut-off value 0.15 defined by Vandensompele et al. [6] is marked by a thick line. The lowest variability is marked with an arrow.
