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Guard cells are specialized cells located around the stomata, or pores, on plant leaves. Their main function is to regulate gas exchange by controlling the opening and closing of these stomata. When guard cells absorb water, they swell and bend, causing the stomata to open, allowing carbon dioxide in for photosynthesis and oxygen out. Conversely, when they lose water, the stomata close to prevent water loss, helping the plant maintain its water balance.

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