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Gustatory sense receptors are clustered in structures called ?, They are found in elevations, called papillae on the surface of the tongue. These sense receptors are also made of separate cells, called gustatory cells.
In most diatoms, the cell wall, called a frustule, is made up of pectin impregnated with hydrated silica. Electron microscopy has shown that the fine markings of the diatom walls are actually pores which give the protoplasm access to the external environment.