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Skin layers stacked into a neat cube make this epidermis cross section an easy way to see how human skin is built from the bottom up. Tall columnar basal cells with oval nuclei line the base, larger rounded spinous cells sit above them, then a band of small, tightly packed granular cells. On top, flattened sheets of stratum corneum pile up like thin pages, capped by a cracked surface of interlocking flakes. Every face shows the cell pattern clearly, which suits an anatomy classroom, a dermatology office shelf or a biology study corner.

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