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A comparison between a PARS image of unstained human breast tissue with conventional bright-field microscope. (a) a standard H&E stained image (b) a PARS mosaic of one hundred frames, total field of view of 1 mm × 1 mm (c,d) zoomed in versions of (b) showing cell nuclei. The image was acquired with a 266 nm excitation source operating at 20 kHz. Scale bar 100 μm. Reprinted with permission from [198].
