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Normal colon tissue—H&E staining. (a,b) BF images taken with the inverted microscope (20×/0.4 NA objective); (c,d) phase maps attained using wDPM system, where color bar represents the OPL through the specimens, in nm (pixels are saturated at 105 nm in (c), and at 120 nm in (d) in order to enhance details in the ROIs).
