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Photomicrographs of axonal arbors in the trigeminal S1 area (S1BF). A, Dura-insensitive VPM neuron. B, C, Dura-sensitive VPM neurons. Roman numerals mark the cortical layers. Immunostained fibers were captured before (monochrome images) and after counterstaining of the tissue with neutral red (color images). Boxed areas in the color images correspond to the higher-power monochrome images. Scale bar, 300 and 100 μm for color and monochrome images, respectively.
