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Related plots of the OPLS-DA model between the nitrate-deprived group and the control. (a) Score scatter plot for metabolite discrimination. (▲) the control; (■) nitrate-deprived group for 6 and 12 h; (□) nitrate-deprived group for 24, 48 and 72 h; (b) VIP plot (with VIP > 1 metabolites); (c) s-plot; square marked metabolites are those with |p(corr)| > 0.6; (d) Loading column plot of the potential metabolites biomarkers.
