STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Xylem plant cells. Coloured scanning electron micrograph (SEM) of xylem cells from a sage stem (Salvia officinalis). The xylem transports water and mineral nutrients from the roots throughout the plant. The walls of the xylem vessels are strengthened with lignin (green), a woody substance that helps to support the plant.
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