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Correlation analysis between the expression of pyoverdine (PVD) biogenesis genes and PVD production at the single-cell level. (a to c) Representative SfGFP, PVD fluorescence images of three reporter strains, with respective single-cell-PVD levels plotted against SfGFP copy numbers. (d) Correlation coefficient between single-cell SfGFP number and PVD fluorescence of multiple PVD-related reporters in FAB medium with or without FeCl3 (1 μM) addition. r, correlation coefficient (Pearson).
