+Guard cells are specialized [plant cells](/wiki/plant_cell) that surround and regulate the opening and closing of [stomata](/wiki/stoma). Through changes in turgor pressure, these vital cells control gas exchange, enabling photosynthesis while minimizing water loss.
+## See also
+- [Stoma](/wiki/stoma)
+- [Photosynthesis](/wiki/photosynthesis)
+- [Transpiration](/wiki/transpiration)
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