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Image of Dr. Pen™ Ultima A6 with (a) description of the various parts of the device, (b) a top view of the cartridge displaying the arrangement of 12 microneedles and (c) a side view of the cartridge with the needles in the "off" position and (d) the needles pushed out of the cartridge at its maximum length. Image of (e) the cartridge visualized under a polarized light microscope. Scale bar represents 1 mm.
