Pollen tube with swollen tip (IMAGE) Martin-Luther-Universität Halle-Wittenberg Caption Pollen tube zoom-in with fluorescently labelled parts: In green one of the enzymes responsible for production of lipid nano domains, in magenta the lipid nano domains discovered and described in the study. The tip of the pollen tube is swollen as a result of the overexpression of the enzyme. Credit Marta Fratini Usage Restrictions You may use these photos for editorial purposes free of charge. 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.