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Number of gene variants detected in the GeoChip functional gene array in planted (P) and unplanted (UP) soils polluted with different Zn (first value) and Cd (second value) concentrations at the end of the experiment. Only those gene variants that were well represented (with a minimum of 5 gene variants) and that showed significant differences (P < 0.05) among treatments, according to ANOVA, are presented.
