Sphere Structures in the Cell Nucleus (IMAGE) Ruhr-University Bochum Caption The fluorescence microscopy image shows several cells grown in the laboratory. In the nucleus (here colored blue), the protein FE65 has fused with other proteins such as BLM to form spherical structures that are seen in yellow. The cytoskeleton of the cell, a very flexible mesh in the cytoplasm, which is formed out of proteins, is shown in red. Credit © Thorsten Müller 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.