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Fluorescence images of FPs samples in the esophagous using 2 different sets of excitation/emission wavelengths (590/610 and 635/670) overlaid on black and white images. Pixel values are in arbitrary units. Colorbar displays the transparency function. Bar chart – Comparison of accumulated FP intensity over a region of interest (dotted square) at the peak wavelength. Procedure defined unit = p.d.u.
