Colorized scanning electron micrograph of an open stoma on the surface of a leaf of lettuce (Lactuca sativa). A stoma is a small pore found on the underside of plant leaves and stems that allow for gas exchange.
B0007377 Lettuce leaf stomata. Wellcome Images available under the following creative commons usage http://creativecommons.org/licenses/by-nc-nd/2.0/uk/
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