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parts as tissue layers inside its body: the upper, intermediate (middle) and lower epithelia. There are at least six different cell types. (A 2023 analysis of 4 species across 3 genera found 8, one with an unknown role.) The upper epithelium is the thinnest portion and essentially comprises flat cells with their cell body hanging underneath the surface, and each cell having a cilium. Crystal cells are sparsely distributed near the marginal edge. A few cells have unusually large

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