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Images of confocal microscopy of the site where one microneedle inserted shows that the fluorescent solution is delivered into the tissue underneath the skin surface. Optical section depths are (a) 30 μm, (b) 60 μm, (c) 90 μm, (d) 120 μm, (e) 150 μm, and (f) 180 μm below the skin surface.
