BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Plant xylem tissue. Light micrograph of a transverse section through xylem tissue from a sunflower (Helianthus) plant stem. The large tubes (seen in cross-section) are lignified vessels along which water flows from the roots to higher areas of the plant. Magnification: x580 when printed at 10 centimetres across.
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