Laccase Enzymes Catalyze Lignification (IMAGE) American Society of Plant Biologists Caption The amount of lignin (stained pink) in the stems of mutants that lack both LACCASE4 and 17 (right) is much lower than in normal plants (left). Fiber cells (red arrow), which have a supportive role, are dramatically hypolignified (no staining), while vascular cells (black arrow) have an irregular shape or are collapsed. Credit Catherine Lapierre Usage Restrictions Use for noncommercial, educational purposes is granted without written permission. Please include a citation and acknowledge ASPB as copyright holder. For all other uses, contact diane@aspb.org. 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.