Effect of copper and iron deficiency on known nutrient-responsive miRNAs. Graphic summary of the opposite effect of copper and iron deficiency on the known -Cu responsive miRNAs 397, 398, 408 and the -P responsive miRNAs 399 and 2111. Phloem responses are compared to data obtained from leaves and roots. All data were obtained from miRNA array hybridization experiments. Differences between stress and control plants are shown as log2 values, only Arabidopsis miRNAs are depicted. n.d.: not detectable.