A confocal micrograph of stained and autofluorescent cells of xylem in the stem of buttercup (Ranunculus), showing xylem vessels whose walls are studded with pits that allow passage of water from one vessel to another.
B0005401 Confocal LS buttercup (Ranunculus) xylem. Wellcome Images available under the following creative commons usage http://creativecommons.org/licenses/by-nc-nd/2.0/uk/
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