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Red receptor cells (without staining) on tertiary pulvinus of Mimosa pudica resemble stomatal guard cells. Arrows show these bright red cells (A) Receptor cells and receptor complex on tertiary pulvinus of mimosa by light microscope (B) and by scanning electron microscope (C). Arrows point to red receptor cells, stars indicate guard cells (out of work), E, elongated excitable motor cells; M, motor cells.
