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Figure 5: Honeycomb-like structure inside a PN slice (200 μm) stained with Hemacolor. (a) Cross-sectional image of the PN-slice showing the inner space structure devoid of cells (arrows). (a1) The image of the inner space in the PN slice at a higher magnification. Note the honeycomb structure (arrowheads, about 10 μm) and granules (inset) in the structure. (a2) The image of the outer part of PN slice stained with Hemacolor. Note the large granular cell (arrow), small round cell (arrowhead), small yellowish cell (open arrowhead), and the granules (inset).