CtBP-RAI2 polymer in a nuclear focus (IMAGE) European Molecular Biology Laboratory Caption The scientists observed the CtBP-RAI2 polymers at different scales: at the cellular level, as aggregates, or ‘foci’, in the nucleus (upper left) and at the molecular level as a stack of molecules captured with cryo-electron microscopy (middle). The latter enabled them to create a detailed structural model (right). Credit Isabel Romero Calvo/EMBL Usage Restrictions Credit must be given to the creator. Adaptations must be shared under the same terms. License CC BY-SA 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.