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Description: The underside of a leaf of Tradescantia zebrina. The majority of the surface is made up of epidermal cells with the occasional stoma - a pore in the leaf which can open and close to control gas exchange, primarily to mimimise loss of water vapour while still taking up carbon dioxide. In this species the stomata cells are green (due to chlorophyll) while the epidermal cells are red in colour due to additional pigmentation.
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