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Calibration of the fluorometric probe using fluorescein solution. Calibration equation: Intensity = (3.66 × 107 ± 4.26 × 105) × Fluorescein concentration + (-49.81 ± 5.07); R2 = 0.99; n = 3. A green emission filter with transmission wavelength range 420–580 nm was used in the probe. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
