Fig. 4From: Selection of reference genes for the quantitative real-time PCR normalization of gene expression in Isatis indigotica fortuneRelative expression of IiCCR using the selected reference genes. The results were normalized using the selected stable reference genes (singly or in combination) and the unstable genes in sample sets across treatment with a N, b different tissues, c ABA, and d MeJA. The bars indicate the standard error (± SE) evaluated from three biological replicatesBack to article page