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Pairwise variation (V) of candidate genes as predicted by GeNorm. The pairwise variation (Vn/Vn + 1) was calculated between the normalization factors NFn and NFn + 1. Each pairwise variation value is compared with a recommended cut-off value 0.15, below which the inclusion of an additional reference gene is not required. RCRI – Catimor 88 inoculated compared to control samples, SCSI – Caturra inoculated compared to control samples.
