2 Pollen Grains Wiewed by Fluorescence Microscopy (image) University of Leicester Share Print E-Mail Caption The image shows two pollen grains viewed by fluorescence microscopy. A pair of red sperm cells are visible in the normal pollen grain (top left) whilst only one red germ cell is present in mutant pollen (bottom right). The sperm cells are visualized using the monomeric red fluorescent protein mRFP1 derived from a coral species. Credit Lynette Brownfield and David Twell, University of Leicester Usage Restrictions Image must be credited to Lynette Brownfield and David Twell, University of Leicester Share Print E-Mail 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.