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Bamboo stem. Coloured scanning electron micrograph (SEM) of a section through a xylem vessel (brown) in a bamboo (family Gramineae) stem. The xylem transports water and mineral nutrients from the roots throughout the plant. The walls of the xylem vessels are strengthened with lignin, a woody substance that helps to support the plant. Magnification: x125 when printed at 10 centimetres wide.
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