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Variation in internal reference genes and their standard curves. Box plot depicting the variation of Cq of (a) GAPDH and (b) Ubiquitin under different experimental conditions of abiotic stress and ontogeny in Coffea canephora; Cq values showing normal distribution for (c) GAPDH and (d) Ubiquitin; standard curve plotted from different dilutions of leaf and endosperm cDNA for (e) GAPDH and (f) Ubiquitin
