Cucumber Tendril Cells and Tissues (IMAGE) Harvard University Caption The lignified cells in the tendril's fiber ribbon glow bright blue under ultraviolet light. The thickened cell walls are clearly visible in the bottom two images. Credit Joshua Puzey and Sharon Gerbode Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.